• GT2 Timing Pulleys for 3D Printers, 16 / 20 / 30 / 36 / 40 Teeth, 5 mm or 8 mm Bore, 6 mm Belt, Aluminium (Multi-Packs)
  • GT2 Timing Pulleys for 3D Printers, 16 / 20 / 30 / 36 / 40 Teeth, 5 mm or 8 mm Bore, 6 mm Belt, Aluminium (Multi-Packs)
  • GT2 Timing Pulleys for 3D Printers, 16 / 20 / 30 / 36 / 40 Teeth, 5 mm or 8 mm Bore, 6 mm Belt, Aluminium (Multi-Packs)
  • GT2 Timing Pulleys for 3D Printers, 16 / 20 / 30 / 36 / 40 Teeth, 5 mm or 8 mm Bore, 6 mm Belt, Aluminium (Multi-Packs)
  • GT2 Timing Pulleys for 3D Printers, 16 / 20 / 30 / 36 / 40 Teeth, 5 mm or 8 mm Bore, 6 mm Belt, Aluminium (Multi-Packs)
  • GT2 timing pulleys – close-up of the pulley fitted on a NEMA 17 stepper motor shaft with a GT2 belt looped around it
  • GT2 timing pulleys – top-down on a workbench: several silver and black pulleys of different tooth counts next to a GT2 belt
  • GT2 timing pulleys – an engineer's fingers tightening the grub screw of the pulley with a small hex key on a motor shaft
  • GT2 timing pulleys – product still life on a white background: a row of pulleys from 16 to 40 teeth arranged by size
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Glunova Biotech

GT2 Timing Pulleys for 3D Printers, 16 / 20 / 30 / 36 / 40 Teeth, 5 mm or 8 mm Bore, 6 mm Belt, Aluminium (Multi-Packs)

GT2 Timing Pulleys for 3D Printers, 16 / 20 / 30 / 36 / 40 Teeth, 5 mm or 8 mm Bore, 6 mm Belt, Aluminium (Multi-Packs)

$13.00 SGD
$13.00 SGD
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Taxes included. Shipping calculated at checkout.
Teeth, bore, pack

GT2 timing pulleys are toothed aluminium wheels with a 2 mm pitch that transfer motion from a stepper motor shaft to a 6 mm GT2 belt, used on the X, Y and Z axes of 3D printers, CoreXY machines, laser engravers, plotters and small CNC routers.

Precision-machined aluminium GT2 timing pulleys for the X, Y and Z axes of 3D printers, CoreXY and CNC builds. 16 and 20-tooth pulleys with a 5 mm bore fit NEMA 17 motor shafts directly; 8 mm bore versions suit lead screws and idler shafts; 30, 36 and 40-tooth pulleys are used for reduction drives and belt-driven Z axes. Each pulley has two flanges to keep the belt on and two M3 grub screws.

What can you use it for?

  • Replacing worn or stripped motor pulleys on Ender 3, Prusa, Voron, Bambu-style and RepRap printers
  • Building CoreXY, H-bot and belt-driven Z-axis motion systems
  • Reduction drives: pair a 16T or 20T motor pulley with a 30T, 36T or 40T driven pulley
  • Laser engravers, pen plotters, camera sliders and belt-driven linear actuators
  • 8 mm bore versions for lead screws, idler shafts and larger motors

Who is it for?

3D-printer owners doing repairs or upgrades, CoreXY and CNC builders, and makers who want spare pulleys on hand in the sizes that actually get used.

Compatibility

  • Belts: GT2 / 2GT 6 mm wide, open-end or closed loop, 2 mm pitch (not GT3 or MXL)
  • Shafts: 5 mm bore fits NEMA 17 stepper motors; 8 mm bore fits 8 mm lead screws and shafts
  • Fixing: two M3 grub screws per pulley, 1.5 mm hex key

Specifications

Profile GT2 / 2GT, 2 mm pitch, for 6 mm wide belts
Teeth options 16, 20, 30, 36, 40
Bore options 5 mm (NEMA 17 shaft) or 8 mm
Material Aluminium alloy, anodised silver or black
Fixing Two M3 grub screws (hex key supplied by user)
16T dimensions Ø13 mm flange, 10 mm pitch diameter, 14 mm total height
20T dimensions Ø16 mm flange, 12 mm pitch diameter, 16 mm total height
Compatible belts GT2 6 mm open-end and closed-loop belts
Pack size 5 pieces (16T / 20T) or 2 pieces (30T / 36T / 40T)

What's in the box

  • 16T, 5 mm bore, silver (5-pack): 5 × GT2 16-tooth pulleys, 5 mm bore, silver, grub screws fitted
  • 16T, 5 mm bore, black (5-pack): 5 × GT2 16-tooth pulleys, 5 mm bore, black
  • 20T, 5 mm bore, silver (5-pack): 5 × GT2 20-tooth pulleys, 5 mm bore, silver
  • 20T, 5 mm bore, black (5-pack): 5 × GT2 20-tooth pulleys, 5 mm bore, black
  • 20T, 8 mm bore, silver (5-pack): 5 × GT2 20-tooth pulleys, 8 mm bore, silver
  • 20T, 8 mm bore, black (5-pack): 5 × GT2 20-tooth pulleys, 8 mm bore, black
  • 30T, 5 mm bore, silver (2-pack): 2 × GT2 30-tooth pulleys, 5 mm bore
  • 30T, 8 mm bore, silver (2-pack): 2 × GT2 30-tooth pulleys, 8 mm bore
  • 36T, 5 mm bore, silver (2-pack): 2 × GT2 36-tooth pulleys, 5 mm bore
  • 36T, 8 mm bore, silver (2-pack): 2 × GT2 36-tooth pulleys, 8 mm bore
  • 40T, 5 mm bore, silver (2-pack): 2 × GT2 40-tooth pulleys, 5 mm bore
  • 40T, 8 mm bore, silver (2-pack): 2 × GT2 40-tooth pulleys, 8 mm bore

Frequently asked questions

Which pulley does my 3D printer use?

Most desktop printers (Ender 3, CR-10, Prusa i3 clones, many CoreXY kits) use a 20-tooth GT2 pulley with a 5 mm bore on the NEMA 17 motor. Voron and some compact builds use 16 teeth. Count the teeth on your old pulley or check your printer's firmware steps/mm: 80 steps/mm at 16 microsteps means 20T, 100 steps/mm means 16T.

Do I need to change firmware after swapping pulleys?

Only if you change the tooth count. Steps per mm = (motor steps × microsteps) ÷ (teeth × 2 mm). Swapping a 20T for another 20T needs no change.

Will these fit an 8 mm lead screw?

Yes, choose the 8 mm bore version. It also fits 8 mm idler shafts and larger motor shafts.

Are they compatible with GT3 or 3 mm pitch belts?

No. These are 2 mm pitch GT2 pulleys for 6 mm wide GT2 belts. GT3 and HTD 3M belts need different pulleys.

How do I secure the pulley to the shaft?

Slide the pulley on, align one grub screw with the flat of the motor shaft if it has one, and tighten both M3 grub screws with a 1.5 mm hex key. A drop of threadlocker stops them loosening from vibration.

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