Free

Pulley Generator by Koolm

Timing belt pulleys for GT2, HTD, MXL, XL and T-series belts with custom bores

Pulley Generator by Koolm is a free browser tool on MakerWorld for belt-driven builds and printer repairs. Free; MakerWorld login needed. Exports STL and 3MF. Last checked .

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What is Pulley Generator by Koolm?

Koolm's Pulley Generator covers the timing pulleys used in 3D printers, CNC machines and robots. Pick a belt profile from a long list that includes MXL, XL, L, GT2, HTD and T-series, then set the tooth count and width to match your belt.

Flanges can be left off, placed on top or on both sides, with adjustable height, thickness and taper. The bore can be round, keyed, D-shaped or hex, and a hub with set screw holes can be added in metric or UTS sizes, with the number, angle and position of the screws under your control. Tooth clearance is set automatically for printing, and screw holes use a teardrop shape so they print cleanly.

It is free with a MakerWorld account and downloads for any slicer. It suits people building or fixing printers, camera sliders, conveyors and other belt-driven projects who would rather not model a pulley from scratch.

What you can make

  • GT2 pulleys
  • HTD pulleys
  • Flanged pulleys
  • Hubbed pulleys with set screws

How to use Pulley Generator by Koolm

  1. Click Customize on the model page
  2. Choose the belt profile and tooth count
  3. Set flanges, bore and hub options
  4. Generate and download

What you'll need to print it

Filament and parts that suit what you make with Pulley Generator by Koolm.

PETG

M3 screws

M3 heat-set inserts

Also handy

Digital calipers

Filament dryers and dry boxes

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Pulley Generator by Koolm pros

  • Wide range of belt profiles
  • Several bore types including D and hex
  • Print-friendly details like teardrop screw holes

Pulley Generator by Koolm cons

  • You need to know your belt profile and tooth count
  • Needs a MakerWorld account

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