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Timing Belt Generator (OwlCAD)

A closed toothed belt as one seamless loop, sized to the two pulleys it runs on

Timing Belt Generator (OwlCAD) is a free browser tool for printing a matching belt for a pair of printed pulleys. The customizers and the editor are free; only OwlCAD's AI features need the Pro subscription. Exports STL and 3MF; no account needed. Last checked 16 October 2026.

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At a glance

Price: The customizers and the editor are free; only OwlCAD's AI features need the Pro subscription
Runs on: Browser
Exports: STL, 3MF
Multicolor: No, single color
Account: Not needed
Open source: No
Skill level: Easy: a few settings to tune
Best for: Printing a matching belt for a pair of printed pulleys
Selling prints: Allowed OwlCAD's terms include commercial use on every plan, the free tier included: you may sell prints, sell or license the files and use them in a product, with no royalty and no attribution required.
How we checked: Opened the generator Customizer opened in a browser with no account: the default GT2 belt loop rendered in 3D with all settings; pricing and terms read
Checked by: Mike Janssen
Last checked: 16 October 2026

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Sources: Timing belt customizer, OwlCAD pricing, OwlCAD terms (checked 16 October 2026)

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What is Timing Belt Generator (OwlCAD)?

The Timing Belt Generator is one of the free customizers in OwlCAD, a browser-based parametric CAD tool. It makes a closed toothed timing belt as one watertight loop, sized to mesh with OwlCAD's pulley generator at the same profile and tooth counts.

You pick the profile by name (GT2-2M, GT2-3M, GT2-5M or HTD-3M), because GT2-3M and HTD-3M share a 3 mm pitch but have different teeth. The belt's tooth count is the main input, the way belts are sold, so the loop closes with no seam; the center distance is then worked out from the two pulleys. Unequal pulleys are handled too. You also set the width and the fit or tooth clearance.

It runs in the browser with no account and costs nothing; only OwlCAD's AI features are paid. It is one of 35 free OwlCAD customizers, and you can open the result in the full editor if you want to change more. Its terms give you full commercial rights to what you make, the free plan included.