{"title":"Robot Arm Parts \u0026 Accessories","description":"\u003cp\u003eSpares, upgrades and add-ons for SO-ARM101, NexArm and other LeRobot arms: Feetech STS3215 and STS3250 servos, metal horns, 3-pin cables, BusLinker and Waveshare adapter boards, 1080p wrist and overhead cameras, camera desk arms, G-clamps, power adapters, training props and the SO-101 Builder's Pack with free 3D-print files.\u003c\/p\u003e","products":[{"product_id":"buslinker-v3-serial-bus-servo-driver-board","title":"Hiwonder BusLinker V3.0 Serial Bus Servo Driver Board, USB-C to TTL, 5–14 V, for SO-ARM101 \/ LeRobot \/ Feetech STS Servos","description":"\u003cp\u003e\u003cstrong\u003eThe BusLinker V3.0 is a small USB-to-servo-bus interface board that powers and talks to half-duplex TTL bus servos (Hiwonder HX series, Feetech STS \/ SCS), letting a PC, Raspberry Pi or microcontroller set servo IDs, read positions and drive a whole chain of servos through a single serial port.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBusLinker V3.0 is the USB servo interface board that ships with the SO-ARM101 kits. Plug it into a laptop over USB-C, feed it 12 V, and it exposes the servo bus as a serial port that LeRobot, the Hiwonder PC tool or your own Python script can talk to. Useful as a spare, for a second arm, or for any project using Feetech-protocol bus servos.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpare or second controller for an SO-ARM101 leader or follower arm\u003c\/li\u003e\n\u003cli\u003eBench tool for setting IDs, zero offsets and angle limits on new servos before building an arm\u003c\/li\u003e\n\u003cli\u003eUSB servo interface for custom LeRobot robots, grippers, pan-tilt heads and hexapods\u003c\/li\u003e\n\u003cli\u003eBridging bus servos to an ESP32, STM32 or Arduino over the TTL header\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eSO-ARM101 and LeRobot builders, students and makers using Feetech-protocol bus servos who need a reliable USB interface with proper power handling.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eServos: Hiwonder HX-10HM \/ HX-30HM \/ HX-65HM, Feetech STS3215, STS3250, SCS series and other 3-pin half-duplex TTL bus servos\u003c\/li\u003e\n\u003cli\u003eHosts: Windows, Ubuntu, macOS (USB serial), Raspberry Pi, Jetson; TTL header for Arduino, ESP32, STM32\u003c\/li\u003e\n\u003cli\u003eSoftware: Hiwonder servo PC tool, Hugging Face LeRobot, Feetech SDK, custom Python via pyserial\u003c\/li\u003e\n\u003cli\u003ePower: 5–14 V DC barrel jack or screw terminal; use 12 V 5 A for a six-servo arm, 7.4 V for 7.4 V servos\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eHiwonder BusLinker V3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003ctd\u003eUSB-to-serial bridge and power distribution for half-duplex TTL bus servos (Hiwonder HX \/ Feetech STS \/ SCS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHost interface\u003c\/th\u003e\n\u003ctd\u003eUSB-C (virtual COM port) or 4-pin TTL header (TX \/ RX \/ GND \/ 5 V) for MCU control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eServo ports\u003c\/th\u003e\n\u003ctd\u003e3 × 3-pin bus servo headers (parallel), daisy-chain more servos through the servos themselves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower input\u003c\/th\u003e\n\u003ctd\u003e5–14 V DC via 5.5 × 2.1 mm barrel jack or screw terminal; powers the servo bus directly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax current\u003c\/th\u003e\n\u003ctd\u003eDepends on supply; 12 V 5 A adapter recommended for a 6-servo arm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBaud rate\u003c\/th\u003e\n\u003ctd\u003eCustom, up to 1 Mbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSoftware\u003c\/th\u003e\n\u003ctd\u003eHiwonder PC servo tool (ID, offset, limits, real-time graphs); works with LeRobot's Feetech motor bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize \/ weight\u003c\/th\u003e\n\u003ctd\u003e42 × 33 × 15 mm, 10 g; 36 × 28 mm mounting holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSample code\u003c\/th\u003e\n\u003ctd\u003ePython, Arduino, ESP32, STM32, Raspberry Pi, Jetson examples\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eDefault Title:\u003c\/strong\u003e 1 × BusLinker V3.0 board (no cables or power adapter)\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eIs this the board inside the SO-ARM101?\u003c\/h3\u003e\u003cp\u003eYes. Each SO-ARM101 arm has one BusLinker V3.0 in its base connecting the six servos to the PC. This listing is the bare board for spares, second arms or custom builds.\u003c\/p\u003e\u003ch3\u003eHow do I connect it?\u003c\/h3\u003e\u003cp\u003eUSB-C to the computer, 12 V into the barrel jack or screw terminal, and the servo chain into any of the three 3-pin ports. The board appears as a serial port; select it in LeRobot or the Hiwonder servo tool.\u003c\/p\u003e\u003ch3\u003eCan it power the servos?\u003c\/h3\u003e\u003cp\u003eYes. The DC input feeds the servo bus directly, so choose an adapter matched to your servos: 12 V for HX-30HM \/ STS3215-C018, 7.4 V for the 7.4 V models. USB alone does not power servos.\u003c\/p\u003e\u003ch3\u003eDoes it work with Feetech STS3215 servos and LeRobot?\u003c\/h3\u003e\u003cp\u003eYes. The protocol is the same Feetech half-duplex bus that LeRobot's motor driver uses; set the port in your robot config and it works like any other Feetech adapter.\u003c\/p\u003e\u003ch3\u003eCan I use it without a computer?\u003c\/h3\u003e\u003cp\u003eYes. The 4-pin TTL header (5 V, GND, TX, RX) lets an Arduino, ESP32 or STM32 drive the bus. Sample code for each platform is provided.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"Default Title","offer_id":50758000214255,"sku":"BUSLINKER-V3","price":16.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_board.jpg?v=1789401560"},{"product_id":"feetech-sts3215-serial-bus-servo","title":"Feetech STS3215 Serial Bus Servo, 30 kg·cm 12 V \/ 19 kg·cm 7.4 V, 360° Magnetic Encoder, for SO-ARM101, LeKiwi, OpenDuck (single or robot sets)","description":"\u003cp\u003e\u003cstrong\u003eThe Feetech STS3215 is a smart serial-bus servo with a 12-bit magnetic encoder, metal gears and 360° multi-turn position feedback that is the standard actuator of the Hugging Face SO-100 \/ SO-101 robot arms, the LeKiwi mobile manipulator and OpenDuck Mini, used wherever a project needs daisy-chained, position-feedback joints controlled from one serial port.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe STS3215 is the servo used in the Hugging Face SO-100 \/ SO-101 arms, the LeKiwi mobile manipulator and OpenDuck Mini. Buy singles to replace a joint, or pick a set that matches the exact voltage and gear-ratio mix the open-source build guides call for.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing or upgrading a joint in an SO-ARM100 \/ SO-ARM101 leader or follower arm\u003c\/li\u003e\n\u003cli\u003eBuilding an SO-101 arm from printed parts: the 12-servo set matches the official bill of materials\u003c\/li\u003e\n\u003cli\u003eLeKiwi mobile base (3 × 12 V wheel servos) or the full LeKiwi robot (base + arm)\u003c\/li\u003e\n\u003cli\u003eOpenDuck Mini bipedal robot (14 × 7.4 V servos)\u003c\/li\u003e\n\u003cli\u003eCustom robots, grippers and pan-tilt heads that need position, load and temperature feedback over one bus\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eLeRobot builders sourcing exact-spec servos, robotics students, and makers who want feedback servos that are cheaper than Dynamixel but supported by open-source software.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eControllers: BusLinker V3.0, Waveshare bus servo adapter, Feetech FE-URT-1, or any 3.3 V \/ 5 V UART with half-duplex direction control\u003c\/li\u003e\n\u003cli\u003eSoftware: Hugging Face LeRobot (feetech motor bus), Feetech FD software, Python (scservo_sdk), Arduino and ESP32 libraries\u003c\/li\u003e\n\u003cli\u003eHorns: 25 T spline, metal horns included; compatible with SO-101 and LeKiwi printed parts\u003c\/li\u003e\n\u003cli\u003eVoltage: C018 runs on 12 V (SO-101 follower joints); C001 \/ C044 \/ C046 run on 7.4 V (leader arm and light joints) — do not feed 12 V to the 7.4 V models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eFeetech STS3215 (ST3215) smart serial bus servo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStall torque\u003c\/th\u003e\n\u003ctd\u003eC018: 30 kg·cm at 12 V; C001 \/ C044 \/ C046: 19 kg·cm at 7.4 V (1:345), lower on the faster ratios\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear ratio\u003c\/th\u003e\n\u003ctd\u003e1:345 (C018, C001), 1:191 (C044), 1:147 (C046)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeed\u003c\/th\u003e\n\u003ctd\u003e0.16 s\/60° (C018 at 12 V); 52 rpm at 7.4 V for 1:345 models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePosition sensor\u003c\/th\u003e\n\u003ctd\u003e12-bit magnetic encoder, 4096 steps over 360°, 0.088° resolution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eControl modes\u003c\/th\u003e\n\u003ctd\u003ePosition (0–360°), constant-speed wheel, open-loop PWM, step mode, multi-turn absolute position\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInterface\u003c\/th\u003e\n\u003ctd\u003eHalf-duplex TTL serial bus, 38 400 bps – 1 Mbps, daisy-chain up to 253 IDs, 3-pin cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFeedback\u003c\/th\u003e\n\u003ctd\u003ePosition, speed, load, voltage, temperature, current, moving status; over-current and over-temperature protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003eC018: 6–12.6 V (use 12 V); C001 \/ C044 \/ C046: 5–8.4 V (2S LiPo or 7.4 V supply)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGears\u003c\/th\u003e\n\u003ctd\u003eMetal (brass and steel), dual-shaft housing with rear bearing, 25 T spline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize \/ weight\u003c\/th\u003e\n\u003ctd\u003e45.2 × 24.7 × 35 mm, 55 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded per servo\u003c\/th\u003e\n\u003ctd\u003eMetal main horn, rear horn, horn screws, mounting screws, 15 cm 3-pin cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3215-C018, 12 V, 30 kg·cm, 1:345:\u003c\/strong\u003e 1 × STS3215-C018 servo, metal main horn, rear horn, screws, 15 cm cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3215-C001, 7.4 V, 19 kg·cm, 1:345:\u003c\/strong\u003e 1 × STS3215-C001 servo with horns, screws and cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3215-C044, 7.4 V, 1:191 (fast):\u003c\/strong\u003e 1 × STS3215-C044 servo with horns, screws and cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3215-C046, 7.4 V, 1:147 (fastest):\u003c\/strong\u003e 1 × STS3215-C046 servo with horns, screws and cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSO-ARM101 12-servo set (6 × 12 V + 6 × 7.4 V, three ratios):\u003c\/strong\u003e 6 × C018 12 V for the follower, 6 × 7.4 V servos in the 1:345 \/ 1:191 \/ 1:147 mix the SO-101 leader arm calls for, horns, screws and cables\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeKiwi base set (3 × 12 V, 1:345):\u003c\/strong\u003e 3 × STS3215-C018 12 V servos with horns, screws and cables\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeKiwi full robot set (9 × 12 V + 6 × 7.4 V):\u003c\/strong\u003e 9 × 12 V and 6 × 7.4 V servos in the three LeKiwi gear ratios, horns, screws and cables\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpenDuck Mini set (14 × 7.4 V, 19 kg·cm, 1:345):\u003c\/strong\u003e 14 × STS3215-C001 servos with horns, screws and cables\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhich STS3215 do I need for the SO-ARM101?\u003c\/h3\u003e\u003cp\u003eThe follower arm uses six 12 V C018 (30 kg·cm) servos. The leader arm uses 7.4 V servos with three different gear ratios so it is light to move by hand: the 12-servo set on this page contains exactly the mix from the SO-101 bill of materials.\u003c\/p\u003e\u003ch3\u003eWhat is the difference between C018, C001, C044 and C046?\u003c\/h3\u003e\u003cp\u003eC018 is the 12 V, 30 kg·cm, 1:345 version. C001 is the 7.4 V, 19 kg·cm, 1:345 version. C044 (1:191) and C046 (1:147) are 7.4 V servos with lower gear ratios: faster and easier to back-drive, less torque; the SO-101 leader arm uses them for the joints you move most.\u003c\/p\u003e\u003ch3\u003eIs it a real Feetech servo?\u003c\/h3\u003e\u003cp\u003eYes. These are genuine Feetech STS3215 servos with the Feetech label, magnetic encoder and metal gearbox, the same part sold by Seeed and Waveshare.\u003c\/p\u003e\u003ch3\u003eCan I control it from Arduino or Raspberry Pi?\u003c\/h3\u003e\u003cp\u003eYes. It speaks the Feetech half-duplex serial protocol. Use a bus servo board such as the BusLinker V3.0 or a Waveshare adapter for USB, or a UART plus direction pin on a microcontroller with the Feetech SCServo library.\u003c\/p\u003e\u003ch3\u003eDoes it do continuous rotation?\u003c\/h3\u003e\u003cp\u003eYes. Besides 0–360° position mode it supports wheel (constant speed) mode, open-loop PWM mode, step mode and multi-turn absolute position, selectable by register.\u003c\/p\u003e\u003ch3\u003eWhat power supply do I need?\u003c\/h3\u003e\u003cp\u003e12 V 5 A for six C018 servos in an arm; 7.4 V (2S LiPo or a 7.4 V supply) for the C001 \/ C044 \/ C046 models. Each servo draws about 0.9 A rated and up to 2–3 A at stall.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"STS3215-C018, 12 V, 30 kg·cm, 1:345","offer_id":50758001230063,"sku":"STS3215-C018","price":24.99,"currency_code":"USD","in_stock":true},{"title":"STS3215-C001, 7.4 V, 19 kg·cm, 1:345","offer_id":50758001262831,"sku":"STS3215-C001","price":22.99,"currency_code":"USD","in_stock":true},{"title":"STS3215-C044, 7.4 V, 1:191 (fast)","offer_id":50758001295599,"sku":"STS3215-C044","price":22.99,"currency_code":"USD","in_stock":true},{"title":"STS3215-C046, 7.4 V, 1:147 (fastest)","offer_id":50758001328367,"sku":"STS3215-C046","price":22.99,"currency_code":"USD","in_stock":true},{"title":"SO-ARM101 12-servo set (6 × 12 V + 6 × 7.4 V, three ratios)","offer_id":50758001361135,"sku":"STS3215-SOARM101-SET","price":249.99,"currency_code":"USD","in_stock":true},{"title":"LeKiwi base set (3 × 12 V, 1:345)","offer_id":50758001393903,"sku":"STS3215-LEKIWI-BASE","price":69.99,"currency_code":"USD","in_stock":true},{"title":"LeKiwi full robot set (9 × 12 V + 6 × 7.4 V)","offer_id":50758001426671,"sku":"STS3215-LEKIWI-FULL","price":309.99,"currency_code":"USD","in_stock":true},{"title":"OpenDuck Mini set (14 × 7.4 V, 19 kg·cm, 1:345)","offer_id":50758001459439,"sku":"STS3215-OPENDUCK","price":274.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_servo.jpg?v=1789401615"},{"product_id":"servo-power-adapter-7-4v-8-4v-3a-dc-5-5x2-1","title":"Servo Power Adapter 7.4 V \/ 8.4 V 3 A, DC 5.5×2.1 mm, 100–240 V, for 7.4 V Bus Servos and SO-ARM101 Leader Arm","description":"\u003cp\u003e\u003cstrong\u003eThis is a regulated 7.4 V (or 8.4 V) 3 A DC power adapter with a 5.5 × 2.1 mm barrel plug that replaces a 2S LiPo battery for bench-powering 7.4 V bus servos such as the Feetech STS3215-C001\/C044\/C046 used in SO-ARM101 leader arms, LeKiwi and OpenDuck builds.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA regulated 7.4 V (or 8.4 V) 3 A supply for the 7.4 V Feetech STS3215 servos used in SO-ARM101 leader arms, LeKiwi and OpenDuck builds. It replaces a 2S LiPo on the bench so you can run and calibrate servos all day from mains power. For 12 V servos and follower arms use a 12 V 5 A adapter instead.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePowering the 7.4 V leader arm of an SO-ARM101 \/ SO-101 pair\u003c\/li\u003e\n\u003cli\u003eBench testing and calibrating 7.4 V STS3215 servos before assembly\u003c\/li\u003e\n\u003cli\u003eRunning OpenDuck Mini or other 2S-servo robots from mains during development\u003c\/li\u003e\n\u003cli\u003e8.4 V version for projects that expect a fully charged 2S pack\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eLeRobot builders and robotics students who buy servos separately and need a safe supply for the 7.4 V models without draining LiPo packs.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFeetech STS3215 7.4 V models (C001, C044, C046) and other 6–8.4 V servos\u003c\/li\u003e\n\u003cli\u003eWaveshare Bus Servo Adapter, BusLinker V3.0, FE-URT-1 (barrel jack)\u003c\/li\u003e\n\u003cli\u003eNot for 12 V servos (STS3215-C018, STS3250): use a 12 V 5 A adapter\u003c\/li\u003e\n\u003cli\u003eMains plug: two flat pins (US \/ CA \/ JP \/ CN); use a travel adapter in EU \/ UK \/ AU\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput\u003c\/th\u003e\n\u003ctd\u003e7.4 V DC 3 A (22 W) or 8.4 V DC 3 A (25 W), regulated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInput\u003c\/th\u003e\n\u003ctd\u003e100–240 V AC 50\/60 Hz, universal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlug\u003c\/th\u003e\n\u003ctd\u003eDC 5.5 × 2.1 mm barrel, centre positive, 1.5 m cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMains plug\u003c\/th\u003e\n\u003ctd\u003eTwo flat pins (fits US \/ CA \/ JP \/ CN sockets; adapter needed for EU \/ UK \/ AU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProtection\u003c\/th\u003e\n\u003ctd\u003eOver-current, over-voltage, short-circuit, over-temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCertification\u003c\/th\u003e\n\u003ctd\u003eCCC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003ctd\u003eFeetech STS3215 7.4 V models (C001\/C044\/C046), SO-ARM101 leader arm, 2S servo projects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.4 V 3 A (for 7.4 V servos):\u003c\/strong\u003e 1 × 7.4 V 3 A adapter with fixed mains cable and 1.5 m DC lead\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8.4 V 3 A (2S LiPo-equivalent):\u003c\/strong\u003e 1 × 8.4 V 3 A adapter with fixed mains cable and 1.5 m DC lead\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhich voltage do I need?\u003c\/h3\u003e\u003cp\u003e7.4 V for the 7.4 V STS3215 models and the SO-ARM101 leader arm; 8.4 V only if your controller expects a fully charged 2S pack. Never feed either to 12 V servos, and never feed 12 V to 7.4 V servos.\u003c\/p\u003e\u003ch3\u003eIs 3 A enough for six servos?\u003c\/h3\u003e\u003cp\u003eFor a leader arm that is moved by hand, yes: the servos are mostly reading position. For a 7.4 V follower doing real lifting, use two adapters or a 5 A supply.\u003c\/p\u003e\u003ch3\u003eDoes the plug fit my socket?\u003c\/h3\u003e\u003cp\u003eThe cable ends in a two-flat-pin plug used in the US, Canada, Japan and China; input is 100–240 V so it works anywhere with a simple plug adapter.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"7.4 V 3 A (for 7.4 V servos)","offer_id":50760955461871,"sku":"PSU-7V4-3A","price":17.99,"currency_code":"USD","in_stock":true},{"title":"8.4 V 3 A (2S LiPo-equivalent)","offer_id":50760955494639,"sku":"PSU-8V4-3A","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_adapter.jpg?v=1789437173"},{"product_id":"waveshare-bus-servo-adapter-board","title":"Waveshare Bus Servo Adapter (A), USB-C \/ UART Driver Board for Feetech ST \/ SC Bus Servos, 9–12.6 V, up to 253 Servos","description":"\u003cp\u003e\u003cstrong\u003eThe Waveshare Bus Servo Adapter (A) is a small USB-C and UART interface board that powers and controls Feetech ST\/SC-series bus servos (STS3215, STS3250) from a PC, Raspberry Pi or microcontroller, and is the board most LeRobot SO-101 and LeKiwi builds use in place of the Hiwonder BusLinker.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Waveshare Bus Servo Adapter (A) is the low-cost USB interface most LeRobot builders use to drive Feetech STS3215 servos from a laptop or Raspberry Pi. Plug in 12 V, connect the servo chain, and the board appears as a serial port for LeRobot, the Waveshare servo tool or your own Python code. A direct alternative to the Hiwonder BusLinker for SO-ARM101 and LeKiwi builds.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eController for a self-built SO-ARM100 \/ SO-ARM101 leader or follower arm\u003c\/li\u003e\n\u003cli\u003eSetting servo IDs and offsets before assembly\u003c\/li\u003e\n\u003cli\u003eLeKiwi mobile base and OpenDuck Mini servo bus\u003c\/li\u003e\n\u003cli\u003eAny Feetech-servo robot driven from Python, ESP32 or Arduino\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eBuilders assembling SO-101 arms from servos and printed parts, and anyone who needs a spare or second USB servo interface.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eServos: Feetech STS3215, STS3250, STS3235, SCS series\u003c\/li\u003e\n\u003cli\u003eHosts: Windows, macOS, Linux, Raspberry Pi (USB serial); ESP32 \/ Arduino \/ STM32 via UART\u003c\/li\u003e\n\u003cli\u003eSoftware: Hugging Face LeRobot (feetech motor bus), Waveshare servo tool, Feetech SDK\u003c\/li\u003e\n\u003cli\u003ePower: 9–12.6 V DC in; use 12 V 5 A for six STS3215-C018\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eWaveshare Bus Servo Adapter (A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eServo protocol\u003c\/th\u003e\n\u003ctd\u003eFeetech ST \/ SC series half-duplex TTL bus (STS3215, STS3250, SCS series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHost interface\u003c\/th\u003e\n\u003ctd\u003eUSB-C (CH343 serial) or 3-pin UART header (TX \/ RX \/ GND), selectable by jumper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eServo ports\u003c\/th\u003e\n\u003ctd\u003e2 × 3-pin servo headers; daisy-chain up to 253 servos\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower input\u003c\/th\u003e\n\u003ctd\u003eDC 9–12.6 V via 5.5 × 2.1 mm barrel jack or screw terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOnboard\u003c\/th\u003e\n\u003ctd\u003ePower switch circuitry, PWR LED, brass standoffs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSoftware\u003c\/th\u003e\n\u003ctd\u003eLeRobot Feetech motor bus, Waveshare bus servo tool, Python SDK, Arduino \/ ESP32 \/ Raspberry Pi examples\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003ctd\u003eAbout 40 × 30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eDefault Title:\u003c\/strong\u003e 1 × Waveshare Bus Servo Adapter (A) with brass standoffs (no cables or power supply)\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eIs this the same as the BusLinker V3.0?\u003c\/h3\u003e\u003cp\u003eFunctionally yes: both turn USB into the Feetech servo bus and pass DC power to the servos. The Waveshare board is the one used in the original SO-100\/SO-101 build guides and LeKiwi; the BusLinker is Hiwonder's version. LeRobot works with either.\u003c\/p\u003e\u003ch3\u003eCan it power the servos from USB?\u003c\/h3\u003e\u003cp\u003eNo. USB only powers the logic. Servos take power from the barrel jack or screw terminal, so connect a 12 V (or 7.4 V) supply.\u003c\/p\u003e\u003ch3\u003eHow many servos can I chain?\u003c\/h3\u003e\u003cp\u003eUp to 253 addresses on one bus; in practice six per arm, limited by the power supply, not the board.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"Default Title","offer_id":50760955592943,"sku":"WS-BUS-SERVO-ADAPTER-A","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_board_3bad5ddc-26f3-423e-9efb-4d0a4b1df279.jpg?v=1789437184"},{"product_id":"feetech-servo-cable-set-3-pin-5264","title":"Feetech Bus Servo Cables, 3-Pin 5264 Connectors, for STS3215 \/ SO-ARM101 \/ LeKiwi, 15–90 cm, 5-Packs and Mixed Set","description":"\u003cp\u003e\u003cstrong\u003eThese are 3-pin bus servo cables with 5264 (2.5 mm) female connectors on both ends, wired the way Feetech STS\/SCS servos require, used to daisy-chain the servos of SO-ARM101, LeKiwi and OpenDuck robots and to connect the first servo to the adapter board.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGenuine Feetech 3-pin bus servo cables with 5264 connectors, the exact type that links STS3215 servos in the SO-ARM101, LeKiwi and OpenDuck. Keep a set on the bench: a chafed or too-short joint cable is the most common reason a LeRobot arm drops a servo ID mid-recording.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing a damaged joint cable in an SO-ARM101 \/ SO-101 arm\u003c\/li\u003e\n\u003cli\u003eWiring a new arm from loose servos (the mixed pack covers one arm)\u003c\/li\u003e\n\u003cli\u003eLonger 40 \/ 90 cm runs from the base servo to a controller mounted elsewhere\u003c\/li\u003e\n\u003cli\u003eLeKiwi base wheels and OpenDuck legs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eAnyone assembling or repairing Feetech-servo robots who wants the correct connector and lengths instead of generic Dupont jumpers.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eServos: Feetech STS3215, STS3250, STS3235, SCS series; Waveshare ST3215\u003c\/li\u003e\n\u003cli\u003eBoards: BusLinker V3.0, Waveshare Bus Servo Adapter, FE-URT-1\u003c\/li\u003e\n\u003cli\u003eNot compatible with PH2.0 or JST-XH servo connectors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eConnector\u003c\/th\u003e\n\u003ctd\u003e5264 3-pin (2.5 mm pitch), female both ends, reverse-wired as Feetech servos require\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWire\u003c\/th\u003e\n\u003ctd\u003e3 × 26 AWG, black \/ red \/ white (90 cm all black)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible servos\u003c\/th\u003e\n\u003ctd\u003eFeetech STS3215, STS3250, STS3235, SCS series, Waveshare ST3215\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible boards\u003c\/th\u003e\n\u003ctd\u003eBusLinker V3.0, Waveshare Bus Servo Adapter, FE-URT-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLengths\u003c\/th\u003e\n\u003ctd\u003e15, 20, 40, 90 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSO-ARM101 reference\u003c\/th\u003e\n\u003ctd\u003eEach arm uses 3 × 100 mm, 5 × 160 mm and 7 × 200 mm class cables; the mixed pack covers one arm with spares\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15 cm, 5-pack:\u003c\/strong\u003e 5 × 15 cm 3-pin cables\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 cm, 5-pack:\u003c\/strong\u003e 5 × 20 cm 3-pin cables\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 cm, 5-pack:\u003c\/strong\u003e 5 × 40 cm 3-pin cables\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90 cm, 2-pack (black):\u003c\/strong\u003e 2 × 90 cm 3-pin cables, all black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixed 12-pack: 4×15 + 4×20 + 4×40 cm:\u003c\/strong\u003e 4 × 15 cm, 4 × 20 cm and 4 × 40 cm 3-pin cables\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhich lengths does an SO-ARM101 arm use?\u003c\/h3\u003e\u003cp\u003eHiwonder's kit ships 3 × 100 mm, 5 × 160 mm and 7 × 200 mm cables per arm. Our 15 cm replaces the 100 mm and 160 mm positions, 20 cm the 200 mm positions; the mixed 12-pack rewires one arm with spares.\u003c\/p\u003e\u003ch3\u003eAre these reverse-wired?\u003c\/h3\u003e\u003cp\u003eYes. Feetech bus cables are wired 1-to-1 so that both connectors carry the same signal, ground and power pins; these match the cables that come with the servos.\u003c\/p\u003e\u003ch3\u003eCan I cut and splice them?\u003c\/h3\u003e\u003cp\u003eYes, they are 26 AWG silicone-insulated wires, but a clean connector-to-connector cable is more reliable in a joint that flexes thousands of times per dataset.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"15 cm, 5-pack","offer_id":50760955691247,"sku":"SVC-5264-15-5","price":8.99,"currency_code":"USD","in_stock":true},{"title":"20 cm, 5-pack","offer_id":50760955724015,"sku":"SVC-5264-20-5","price":8.99,"currency_code":"USD","in_stock":true},{"title":"40 cm, 5-pack","offer_id":50760955756783,"sku":"SVC-5264-40-5","price":9.99,"currency_code":"USD","in_stock":true},{"title":"90 cm, 2-pack (black)","offer_id":50760955789551,"sku":"SVC-5264-90-2","price":8.99,"currency_code":"USD","in_stock":true},{"title":"Mixed 12-pack: 4×15 + 4×20 + 4×40 cm","offer_id":50760955822319,"sku":"SVC-5264-MIX-12","price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/02_224b90fe-6d52-4aa6-85a5-2457867d5b93.jpg?v=1789437196"},{"product_id":"usb-camera-module-1080p-wide-angle-lerobot","title":"USB Camera Module 1080p 2 MP UVC, Wide-Angle M12 Lens (60°–140°), Plug-and-Play for LeRobot Wrist and Overhead Cameras","description":"\u003cp\u003e\u003cstrong\u003eThis is a 32 mm square 1080p USB camera board with an interchangeable M12 lens that works as a plug-and-play UVC webcam on any computer, used as the wrist (eye-in-hand) camera and the overhead (third-person) camera when recording LeRobot imitation-learning datasets with SO-ARM101, NexArm, Koch or Moss arms.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA small 1080p UVC camera board with an M12 lens, the kind of module used as the wrist (first-person) and overhead (third-person) cameras in LeRobot datasets. It needs no driver, works with OpenCV out of the box, and the 32 mm square board screws onto a printed bracket. Pick 90° for a wrist camera, 110°–140° for an overhead view of the whole workspace.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWrist camera on a SO-ARM101 gripper (90° lens)\u003c\/li\u003e\n\u003cli\u003eOverhead workspace camera on a desk arm (110°–140° lens)\u003c\/li\u003e\n\u003cli\u003eRaspberry Pi and Jetson vision projects with OpenCV\u003c\/li\u003e\n\u003cli\u003eReplacing the 480p camera in a Standard kit with 1080p\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eLeRobot users adding a second or third view, and makers who want a small board camera that OpenCV recognises immediately.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eOS: Windows, macOS, Linux, Raspberry Pi OS, Android (UVC, no driver)\u003c\/li\u003e\n\u003cli\u003eSoftware: OpenCV \/ LeRobot OpenCVCamera, ffmpeg, v4l2, OBS\u003c\/li\u003e\n\u003cli\u003eMounting: 4 holes on a 32 × 32 mm board; fits printed wrist and overhead brackets (STL in our Builder's Pack)\u003c\/li\u003e\n\u003cli\u003eConnection: USB 2.0, 1 m cable with 4-pin 2.0 mm board connector\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSensor\u003c\/th\u003e\n\u003ctd\u003e1\/3.2\" 2 MP CMOS, 1920 × 1080\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrame rates\u003c\/th\u003e\n\u003ctd\u003e1080p 30 fps MJPG, 720p 30 fps, 640 × 480 30 fps (5 fps YUV at 1080p)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInterface\u003c\/th\u003e\n\u003ctd\u003eUSB 2.0, UVC, no driver on Windows \/ macOS \/ Linux \/ Raspberry Pi \/ Android\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLens\u003c\/th\u003e\n\u003ctd\u003eM12 mount; 60°, 90°, 110° or 140° field of view, interchangeable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBoard\u003c\/th\u003e\n\u003ctd\u003e32 × 32 mm, 4 mounting holes, 4-pin 2.0 mm connector, 1 m USB cable included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower\u003c\/th\u003e\n\u003ctd\u003e5 V, 80–130 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocus\u003c\/th\u003e\n\u003ctd\u003eManual, set by turning the lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSoftware\u003c\/th\u003e\n\u003ctd\u003eOpenCV, LeRobot OpenCVCamera, ffmpeg, v4l2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e60° no-distortion (4.13 mm):\u003c\/strong\u003e 1 × camera board with 4.13 mm lens, 1 m USB cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° no-distortion (2.74 mm):\u003c\/strong\u003e 1 × camera board with 2.74 mm lens, 1 m USB cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e110° wide (2.9 mm):\u003c\/strong\u003e 1 × camera board with 2.9 mm lens, 1 m USB cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e140° wide (2.1 mm):\u003c\/strong\u003e 1 × camera board with 2.1 mm lens, 1 m USB cable\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhich lens for a wrist camera?\u003c\/h3\u003e\u003cp\u003e90° no-distortion: wide enough to see the gripper fingers and the object, without fisheye curvature that confuses policies.\u003c\/p\u003e\u003ch3\u003eWhich lens for the overhead camera?\u003c\/h3\u003e\u003cp\u003e110° or 140° so the whole workspace fits from 40–60 cm above the desk; the 140° lens has visible barrel distortion, which LeRobot tolerates.\u003c\/p\u003e\u003ch3\u003eWhat frame rate does LeRobot get?\u003c\/h3\u003e\u003cp\u003e30 fps at 640 × 480 or 1280 × 720 MJPG, which is what most configs use; 1080p also runs at 30 fps in MJPG.\u003c\/p\u003e\u003ch3\u003eIs the focus adjustable?\u003c\/h3\u003e\u003cp\u003eYes, manually by turning the M12 lens; set it once for your working distance.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"60° no-distortion (4.13 mm)","offer_id":50760955887855,"sku":"USBCAM-2MP-60","price":29.99,"currency_code":"USD","in_stock":true},{"title":"90° no-distortion (2.74 mm)","offer_id":50760955920623,"sku":"USBCAM-2MP-90","price":36.99,"currency_code":"USD","in_stock":true},{"title":"110° wide (2.9 mm)","offer_id":50760955953391,"sku":"USBCAM-2MP-110","price":34.99,"currency_code":"USD","in_stock":true},{"title":"140° wide (2.1 mm)","offer_id":50760955986159,"sku":"USBCAM-2MP-140","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_module.jpg?v=1789437203"},{"product_id":"overhead-camera-desk-arm-clamp-1-4-ball-head","title":"Overhead Camera Desk Arm with C-Clamp, 3-Section Articulated Metal Arm, 1\/4\" Ball Head, for Third-Person LeRobot Cameras","description":"\u003cp\u003e\u003cstrong\u003eThis is a three-section articulated aluminium camera arm with a steel desk clamp and a 1\/4\"-20 ball head that holds a webcam or camera board above a robot's workspace, giving LeRobot datasets the fixed overhead (third-person) view that Hiwonder's Advanced kit includes on a stand.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA clamp-on articulated arm that puts a camera above the workspace of an SO-ARM101 or NexArm, the third-person view LeRobot policies train on. It clamps to the desk edge, swings out of the way when you need the bench, and the 1\/4\" ball head takes a webcam or a camera board on a small bracket (STL supplied with our Builder's Pack).\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eOverhead camera for SO-ARM101, NexArm, Koch or Moss teleoperation and recording\u003c\/li\u003e\n\u003cli\u003eHolding a phone or webcam to film demos\u003c\/li\u003e\n\u003cli\u003eLights or a second camera for multi-view datasets\u003c\/li\u003e\n\u003cli\u003eSwinging the camera away when the bench is needed for something else\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eLeRobot users who bought a Starter or Standard kit, or built their own arm, and need the overhead view without a floor stand.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHead: 1\/4\"-20 thread for webcams, action cameras, phone holders and camera-board brackets\u003c\/li\u003e\n\u003cli\u003eDesk: edge up to about 7 cm thick\u003c\/li\u003e\n\u003cli\u003eCameras: our 1080p USB module on a printed bracket (STL supplied with the Builder's Pack), Logitech-style webcams, phones with a 1\/4\" clamp\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eArm\u003c\/th\u003e\n\u003ctd\u003eThree aluminium sections with knurled locking joints, 360° rotation at the base\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead\u003c\/th\u003e\n\u003ctd\u003e1\/4\"-20 ball head for webcams, action cameras, camera boards on a bracket, lights or phones (holder not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMount\u003c\/th\u003e\n\u003ctd\u003eSteel C-clamp for desk edges up to about 7 cm thick, no drilling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRiser option\u003c\/th\u003e\n\u003ctd\u003e68 cm vertical pole to get the camera high above a robot workspace\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad\u003c\/th\u003e\n\u003ctd\u003eUp to about 1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColour\u003c\/th\u003e\n\u003ctd\u003eMatte black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-section arm + desk clamp:\u003c\/strong\u003e 1 × 3-section arm, 1 × 1\/4\" ball head, 1 × desk C-clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-section arm + 68 cm riser + desk clamp:\u003c\/strong\u003e Arm, ball head, 68 cm riser pole, desk C-clamp\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eHow high can the camera go?\u003c\/h3\u003e\u003cp\u003eAbout 60 cm above the desk with the arm alone, and 110–120 cm with the 68 cm riser, which is what a 110° lens needs to see a 60 × 60 cm workspace.\u003c\/p\u003e\u003ch3\u003eDoes it hold a camera board without a housing?\u003c\/h3\u003e\u003cp\u003eYes, with a small bracket that has a 1\/4\" nut; the printable bracket file is part of our free SO-101 print set.\u003c\/p\u003e\u003ch3\u003eDoes it wobble?\u003c\/h3\u003e\u003cp\u003eLock all three knurled joints and it holds a 1 kg load steady; for datasets, avoid bumping the desk.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"3-section arm + desk clamp","offer_id":50760956051695,"sku":"CAMARM-3S-CLAMP","price":39.99,"currency_code":"USD","in_stock":true},{"title":"3-section arm + 68 cm riser + desk clamp","offer_id":50760956084463,"sku":"CAMARM-3S-68-CLAMP","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_arm.jpg?v=1789437210"},{"product_id":"g-clamps-heavy-duty-4-pack-robot-arm-mount","title":"Heavy-Duty G-Clamps 4-Pack, 2\" or 3\" Cast Iron C-Clamps for Fixing SO-ARM101 \/ LeRobot Arm Bases to a Desk","description":"\u003cp\u003e\u003cstrong\u003eThese are heavy-duty cast-iron G-clamps (C-clamps) sold in packs of four, used to fix the base plates of SO-ARM101 and other desktop robot arms to a desk edge so the arm cannot shift during calibration, teleoperation or dataset recording.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSO-ARM101 and other SO-101 arms are held to the desk with two G-clamps through the slots in the base plate; a wobbling base ruins calibration and datasets. These heavy-duty 2-inch clamps are the size Hiwonder ships with its kits, sold as a 4-pack for a leader + follower pair.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eClamping a leader + follower pair (two clamps per arm)\u003c\/li\u003e\n\u003cli\u003eFixing an overhead camera stand base or a work surface\u003c\/li\u003e\n\u003cli\u003eGeneral workbench and 3D-printer frame assembly\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eAnyone who bought a DIY or servo-only arm kit, or lost the clamps from a boxed kit.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSO-ARM100 \/ SO-ARM101 base plates (2-inch clamps), thicker desks or NexArm bases (3-inch)\u003c\/li\u003e\n\u003cli\u003eDesk edge thickness: up to 50 mm (2\") or 86 mm (3\")\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eG-clamp (C-clamp), heavy-duty thickened frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eDuctile cast iron frame, heat-treated steel screw, swivel pad\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOpening\u003c\/th\u003e\n\u003ctd\u003e2\": 50 mm; 3\": 86 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHandle\u003c\/th\u003e\n\u003ctd\u003eT-bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003ctd\u003eTwo clamps per SO-101 base plate; four clamps fix a leader + follower pair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eOrange powder coat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch (50 mm opening), 4-pack:\u003c\/strong\u003e 4 × 2-inch heavy-duty G-clamps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-inch (86 mm opening), 4-pack:\u003c\/strong\u003e 4 × 3-inch heavy-duty G-clamps\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhich size for an SO-ARM101?\u003c\/h3\u003e\u003cp\u003e2-inch. The base plate is 5 mm thick and most desks are 20–40 mm, well inside the 50 mm opening.\u003c\/p\u003e\u003ch3\u003eWill they scratch the desk?\u003c\/h3\u003e\u003cp\u003eThe swivel pad is flat steel; put a scrap of card or rubber under it on a finished desk.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"2-inch (50 mm opening), 4-pack","offer_id":50760956149999,"sku":"GCLAMP-2IN-4","price":24.99,"currency_code":"USD","in_stock":true},{"title":"3-inch (86 mm opening), 4-pack","offer_id":50760956182767,"sku":"GCLAMP-3IN-4","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_clamp.jpg?v=1789437217"},{"product_id":"feetech-sts3250-serial-bus-servo-50kg","title":"Feetech STS3250 Serial Bus Servo, 50 kg·cm 12 V, Full Metal Case, 360° Magnetic Encoder, Upgrade for SO-ARM101 Shoulder Joints","description":"\u003cp\u003e\u003cstrong\u003eThe Feetech STS3250 is a 12 V serial bus servo with 50 kg·cm of torque in a full metal case, using the same protocol, connector and 25 T spline as the STS3215, so it drops into SO-ARM101 shoulder and elbow joints, LeKiwi bases and other LeRobot-compatible robots that need more holding force.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe STS3250 is the metal-case big brother of the STS3215: same bus protocol and cable, 50 kg·cm instead of 30, aluminium body and coreless motor. Builders drop it into the shoulder and elbow of SO-101 arms that carry heavier grippers or cameras, and into LeKiwi bases. Works with the same BusLinker \/ Waveshare adapters and LeRobot configs.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eUpgrading the shoulder and elbow of an SO-ARM101 that carries a heavier gripper or camera\u003c\/li\u003e\n\u003cli\u003eLeKiwi drive wheels and heavier mobile bases\u003c\/li\u003e\n\u003cli\u003eQuadrupeds, humanoids and grippers that stall 30 kg·cm servos\u003c\/li\u003e\n\u003cli\u003eAny Feetech-bus robot needing 50 kg·cm with position feedback\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eBuilders who have hit the torque limit of the STS3215 and want a plug-compatible step up without changing controllers or software.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBus: Feetech half-duplex TTL, mixes with STS3215 on the same chain\u003c\/li\u003e\n\u003cli\u003eControllers: BusLinker V3.0, Waveshare Bus Servo Adapter, FE-URT-1\u003c\/li\u003e\n\u003cli\u003eSoftware: LeRobot (feetech), Feetech SDK, Waveshare tool\u003c\/li\u003e\n\u003cli\u003eHorns: 25 T spline, same as STS3215; the C001 variant includes a metal bracket\u003c\/li\u003e\n\u003cli\u003ePower: 12 V, plan 2–3 A per servo under load\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eFeetech STS3250 (ST-3250)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStall torque\u003c\/th\u003e\n\u003ctd\u003e50 kg·cm at 12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeed\u003c\/th\u003e\n\u003ctd\u003e75 rpm at 12 V (0.13 s\/60°)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e12 V (6–12.6 V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCase\u003c\/th\u003e\n\u003ctd\u003eFull aluminium alloy, dual shaft, 25 T spline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGears\u003c\/th\u003e\n\u003ctd\u003eHardened steel gear train, coreless motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEncoder\u003c\/th\u003e\n\u003ctd\u003e12-bit magnetic, 360°, multi-turn\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInterface\u003c\/th\u003e\n\u003ctd\u003eFeetech half-duplex TTL bus, same protocol as STS3215\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e74.5 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded\u003c\/th\u003e\n\u003ctd\u003eHorn, screws, cable; C001 adds a metal mounting bracket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3250-C002 (servo only):\u003c\/strong\u003e 1 × STS3250 servo, horn, screws, cable, manual\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3250-C001 (with metal bracket):\u003c\/strong\u003e 1 × STS3250 servo with metal U-bracket, horn, screws, cable, manual\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eDoes it fit the SO-ARM101 printed parts?\u003c\/h3\u003e\u003cp\u003eThe STS3250 is larger (about 45 × 24 × 35 mm body plus the metal case) than the STS3215, so the standard SO-101 shoulder parts need a modified pocket; several community remixes exist and our print files include an STS3250 shoulder option.\u003c\/p\u003e\u003ch3\u003eSame speed as the STS3215?\u003c\/h3\u003e\u003cp\u003eFaster: 75 rpm at 12 V versus about 45–60 rpm, with 50 kg·cm stall torque.\u003c\/p\u003e\u003ch3\u003eDo I need new software?\u003c\/h3\u003e\u003cp\u003eNo. It speaks the same Feetech protocol; set its ID and it appears alongside the STS3215 in LeRobot.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"STS3250-C002 (servo only)","offer_id":50760956379375,"sku":"STS3250-C002","price":74.99,"currency_code":"USD","in_stock":true},{"title":"STS3250-C001 (with metal bracket)","offer_id":50760956412143,"sku":"STS3250-C001","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_760e5a8a-456c-42eb-98fc-855411612950.jpg?v=1789437226"},{"product_id":"training-props-100-colored-wooden-cubes-tray","title":"Robot Training Props: 100 Colored Wooden Cubes (10 Colors) with 10×10 Tray, for Pick-and-Place, Sorting and Stacking Datasets","description":"\u003cp\u003e\u003cstrong\u003eThis is a set of 100 painted 2 cm wooden cubes in ten colours with a gridded wooden tray, used as standardised objects for pick-and-place, colour-sorting and stacking tasks when recording imitation-learning demonstrations with desktop robot arms.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eEvery LeRobot tutorial starts with picking up a small block. This set gives you 100 identical 2 cm cubes in ten colours and a gridded tray, so you can record hundreds of consistent sort-by-colour, stack and put-in-place episodes without hunting for objects that fit the gripper.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSort-by-colour and put-in-tray tasks for ACT \/ Diffusion \/ VLA training\u003c\/li\u003e\n\u003cli\u003eStacking and tower-building demos\u003c\/li\u003e\n\u003cli\u003eConsistent objects for reproducible evaluation across episodes\u003c\/li\u003e\n\u003cli\u003eClassroom robotics exercises\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eLeRobot users and educators who need many identical, gripper-sized objects and a fixed target layout.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSO-ARM101 \/ SO-101 gripper (opens to about 5 cm)\u003c\/li\u003e\n\u003cli\u003eNexArm parallel gripper, Koch v1.1, Moss and similar desktop arms\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eContents\u003c\/th\u003e\n\u003ctd\u003e100 wooden cubes in 10 colours (10 per colour) plus a 10 × 10 wooden tray\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCube size\u003c\/th\u003e\n\u003ctd\u003eAbout 2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBeech-type hardwood, water-based paint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003ctd\u003eColour sorting, stacking, put-in-tray and pick-and-place tasks; the tray gives a fixed grid for repeatable episodes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eSO-ARM101 \/ SO-101 grippers, NexArm gripper, Koch and Moss arms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eDefault Title:\u003c\/strong\u003e 100 × 2 cm wooden cubes (10 colours), 1 × 10 × 10 wooden tray\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhy cubes and not random household objects?\u003c\/h3\u003e\u003cp\u003eIdentical cubes make episodes comparable: the policy learns the task, not the object. Ten colours let you define sorting rules that a camera can see clearly.\u003c\/p\u003e\u003ch3\u003eAre they safe for the gripper?\u003c\/h3\u003e\u003cp\u003eYes, 2 cm hardwood cubes weigh about 6 g each and do not deform or slip in a 3D-printed gripper.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"Default Title","offer_id":50760956477679,"sku":"PROPS-CUBES-100","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_board_d49931d5-95c1-456e-aa1c-60ada35b9535.jpg?v=1789437233"},{"product_id":"feetech-sts3215-metal-servo-horns-25t","title":"Feetech STS3215 Metal Servo Horns 25T, 6061 Aluminium Main + Rear Horn Set and 25T Arms, with Screws","description":"\u003cp\u003e\u003cstrong\u003eThese are anodised 6061-T6 aluminium servo horns with the 25-tooth 5.9 mm spline of Feetech STS3215, STS3250 and SCS servos: matched main and rear horn sets for SO-ARM101 joints, round 25 T output discs and 35 mm single-sided arms, all with mounting screws.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eReplacement and upgrade horns for the STS3215 servos in SO-ARM101, LeKiwi and OpenDuck builds. The plastic horns supplied with cheaper servo lots strip under load; these anodised 6061 horns match the metal ones Hiwonder ships in its kits. Buy the 6-set to re-horn a whole arm.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing stripped plastic horns on cheap STS3215 lots\u003c\/li\u003e\n\u003cli\u003eRe-horning a whole SO-ARM101 arm (6-set)\u003c\/li\u003e\n\u003cli\u003eBuilding custom grippers, pan-tilt heads and linkages with the 35 mm arm\u003c\/li\u003e\n\u003cli\u003eLeKiwi and OpenDuck joints\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eSO-101 builders who bought bare servos, and anyone whose kit shipped with plastic horns.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eServos: Feetech STS3215, STS3250, STS3235, STS5420M, SCS20, SM40BL and other 25 T \/ 5.9 mm outputs\u003c\/li\u003e\n\u003cli\u003eParts: SO-ARM100 \/ SO-ARM101 printed joints (main + rear horn), Hiwonder and Waveshare kits\u003c\/li\u003e\n\u003cli\u003eScrews: M2 horn screws and M3 centre screw included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSpline\u003c\/th\u003e\n\u003ctd\u003e25 T, 5.9 mm, Feetech STS3215 \/ STS3250 \/ STS3235 \/ SCS series output shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e6061-T6 aluminium, anodised\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMain horn\u003c\/th\u003e\n\u003ctd\u003eRound disc, 4 × M2 holes, with M3 centre screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRear horn\u003c\/th\u003e\n\u003ctd\u003eFree-turning rear disc for the servo's second shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e25T arm\u003c\/th\u003e\n\u003ctd\u003e35 mm single-sided arm, 6 mm thick, M2 \/ M3 holes, 4.3 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded\u003c\/th\u003e\n\u003ctd\u003eMounting screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3215 main + rear horn set with screws (1 servo):\u003c\/strong\u003e 1 × main horn, 1 × rear horn, screws\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3215 main + rear horn set × 6 (one arm):\u003c\/strong\u003e 6 × main horn, 6 × rear horn, screws\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25T metal output horn (round, single):\u003c\/strong\u003e 1 × 25 T round horn with screws\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25T metal arm 35 mm (single, colour random):\u003c\/strong\u003e 1 × 25 T 35 mm arm with screws (red or blue)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eDo I need the rear horn?\u003c\/h3\u003e\u003cp\u003eYes for SO-101 joints: the printed link is clamped between the main horn on the output shaft and the free-turning rear horn on the servo's second shaft.\u003c\/p\u003e\u003ch3\u003eWill these fit the STS3250?\u003c\/h3\u003e\u003cp\u003eYes, the STS3250 uses the same 25 T spline; only the mounting pattern of the servo body differs.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"STS3215 main + rear horn set with screws (1 servo)","offer_id":50760956575983,"sku":"HORN-3215-SET-1","price":6.99,"currency_code":"USD","in_stock":true},{"title":"STS3215 main + rear horn set × 6 (one arm)","offer_id":50760956608751,"sku":"HORN-3215-SET-6","price":32.99,"currency_code":"USD","in_stock":true},{"title":"25T metal output horn (round, single)","offer_id":50760956641519,"sku":"HORN-25T-DISC-1","price":4.99,"currency_code":"USD","in_stock":true},{"title":"25T metal arm 35 mm (single, colour random)","offer_id":50760956674287,"sku":"HORN-25T-ARM-1","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_horn_kit.jpg?v=1789437242"},{"product_id":"so-101-builders-pack-hardware-no-servos","title":"SO-101 Builder's Pack (No Servos): Servo Adapter Board, 12 Metal Horn Sets, Cables, Power Adapter, G-Clamps + Free 3D-Print Files, for SO-ARM100 \/ SO-ARM101 LeRobot Arms","description":"\u003cp\u003e\u003cstrong\u003eThe SO-101 Builder's Pack is a hardware bundle for people building a LeRobot SO-ARM100 \/ SO-ARM101 arm from their own STS3215 servos and 3D-printed parts: the USB servo adapter, metal horns, servo cables, power adapter and desk clamps that boxed kits include but nobody sells separately, together with a free download of ArmDojo's SO-101 print files.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eEverything around the servos that an SO-101 build needs and that nobody sells as one bag: the USB servo adapter, twelve metal horns, the right cables in the right lengths, a power adapter and the clamps, plus a free download of our 3D-print files. Pair it with a 12-servo STS3215 set and a roll of PLA and you have a complete leader–follower rig for a fraction of a boxed kit.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCompleting a Seeed or Feetech 12-servo set into a working leader–follower pair\u003c\/li\u003e\n\u003cli\u003eBuilding a second follower arm for bimanual setups\u003c\/li\u003e\n\u003cli\u003eClassroom builds where students print the parts themselves\u003c\/li\u003e\n\u003cli\u003eReplacing the miscellaneous hardware after moving a kit between labs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eMakers and labs who already have (or are buying) STS3215 servos and a 3D printer, and want the rest of the bill of materials in one order.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eArms: SO-ARM100, SO-ARM101 (LeRobot SO-101), leader and follower\u003c\/li\u003e\n\u003cli\u003eServos: 6 × Feetech STS3215 per arm (12 V for follower, 7.4 V mix for leader), sold separately as the SO-ARM101 12-servo set\u003c\/li\u003e\n\u003cli\u003eSoftware: Hugging Face LeRobot so101 configs; the Waveshare adapter appears as a serial port\u003c\/li\u003e\n\u003cli\u003ePrinting: PLA or PETG, about 1 kg per pair; files download after purchase\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eGetting started: from unboxing to your first LeRobot dataset\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003ePrint the parts from the download link in your order email (leader and follower STLs, camera brackets).\u003c\/li\u003e\n\u003cli\u003eSet the servo IDs 1–6 with the Waveshare adapter and the Feetech tool before assembly.\u003c\/li\u003e\n\u003cli\u003eFit the metal main + rear horns to each servo and assemble the joints following the SO-101 guide.\u003c\/li\u003e\n\u003cli\u003eWire the chain with the 15 \/ 20 \/ 40 cm cables, base servo to the adapter.\u003c\/li\u003e\n\u003cli\u003eClamp the base to the desk with two G-clamps, connect power and USB, and run LeRobot calibration.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eFor\u003c\/th\u003e\n\u003ctd\u003eSO-ARM100 \/ SO-ARM101 (LeRobot SO-101) arms built from your own or our free 3D-printed parts and 6 Feetech STS3215 servos per arm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePer arm\u003c\/th\u003e\n\u003ctd\u003e1 × Waveshare Bus Servo Adapter (A), 6 × STS3215 metal main + rear horn sets with screws, 12 × 3-pin servo cables (4 × 15, 4 × 20, 4 × 40 cm), 1 × 7.4 V 3 A power adapter (leader) or 12 V supply note (follower), 2 × 2-inch G-clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3D files\u003c\/th\u003e\n\u003ctd\u003eFree download of ArmDojo's SO-101 print files (STL, leader and follower) with every order; link is in the order confirmation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNot included\u003c\/th\u003e\n\u003ctd\u003eSTS3215 servos (sold separately: SO-ARM101 12-servo set), printed parts, cameras\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePair pack\u003c\/th\u003e\n\u003ctd\u003eTwo of everything above: two adapters, 12 horn sets, 24 cables, two power adapters, four clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne arm (follower or leader):\u003c\/strong\u003e 1 × Waveshare Bus Servo Adapter (A), 6 × STS3215 metal main + rear horn sets with screws, 12 × 3-pin cables (4 × 15, 4 × 20, 4 × 40 cm), 1 × 7.4 V 3 A power adapter, 2 × 2-inch G-clamps, download card for the 3D-print files\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeader + follower pair:\u003c\/strong\u003e 2 × Waveshare adapters, 12 × horn sets, 24 × cables, 2 × power adapters (7.4 V for the leader, 8.4 V\/12 V note for the follower), 4 × G-clamps, download card\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhat is not included?\u003c\/h3\u003e\u003cp\u003eThe servos and the printed plastic parts. Add the SO-ARM101 12-servo set from this store, print the parts from our free files, and you have a complete pair. Cameras are optional and sold separately.\u003c\/p\u003e\u003ch3\u003eWhich power adapter comes in the pack?\u003c\/h3\u003e\u003cp\u003eA 7.4 V 3 A adapter for the leader arm. A follower built from 12 V STS3215-C018 servos needs a 12 V 5 A supply; if you tell us at checkout we swap the adapter.\u003c\/p\u003e\u003ch3\u003eAre the 3D files really free?\u003c\/h3\u003e\u003cp\u003eYes. Every Builder's Pack order includes a download link to ArmDojo's SO-101 print files, licensed for personal and educational use.\u003c\/p\u003e\u003ch3\u003eIs this cheaper than a boxed DIY kit?\u003c\/h3\u003e\u003cp\u003eServo set plus Builder's Pack comes to roughly the price of the Hiwonder DIY kit while letting you print the parts in any colour and swap in STS3250 shoulders.\u003c\/p\u003e","brand":"ArmDojo","offers":[{"title":"One arm (follower or leader)","offer_id":50760956739823,"sku":"SO101-BUILD-1","price":69.99,"currency_code":"USD","in_stock":true},{"title":"Leader + follower pair","offer_id":50760956772591,"sku":"SO101-BUILD-2","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_collage.jpg?v=1789437248"}],"url":"https:\/\/armdojo.com\/collections\/robot-arm-parts-accessories.oembed","provider":"ArmDojo","version":"1.0","type":"link"}