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Evolvent Design 3D Gear Generator

Spur gear generator from a gear specialist; STL download unlocked via Patreon

Evolvent Design 3D Gear Generator is a freemium browser tool for precise spur gears. Design and SVG/DXF export free; STL download needs a code from the Patreon 'Helical Gear' tier ($6 a month) or higher. Exports STL and SVG; an account is needed to download. Last checked 25 September 2026.

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Opens evolventdesign.com

At a glance

Price: Design and SVG/DXF export free; STL download needs a code from the Patreon 'Helical Gear' tier ($6 a month) or higher
Runs on: Browser
Exports: STL, SVG
Multicolor: No, single color
Account: Required to download
Open source: No
Skill level: Easy: a few settings to tune
Best for: Precise spur gears
How we checked: Opened the generator Generator loads with external pair, rack and pinion and internal pair modes; DXF and SVG download free, STL needs a Patreon code
Checked by: Mike Janssen
Last checked: 25 September 2026

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Sources: Evolvent Design gear STL generator, Evolvent Design Patreon tiers (checked 25 September 2026)

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About this generator

Evolvent Design 3D Gear Generator is a freemium browser tool that designs spur gears and exports them for laser cutting and 3D printing. It comes from Evolvent Design, a gear engineering company known for its online gear calculators.

You design a gear pair in the browser, as two external gears, a rack and pinion or an internal pair, by setting tooth counts, module, pressure angle, clearance, face widths, bores and keyways, with a preview as you go. Exports cover SVG and DXF for 2D work such as laser cutting, and STL for 3D printing.

The 2D files are available straight away, but the STL download is unlocked with a code that Patreon supporters on the 'Helical Gear' tier ($6 a month) or higher receive. Professional users are pointed to its separate GearCalculators software. It suits users who value accurate involute geometry and are happy to support the developer. If you only need the occasional printable gear for free, the MakerWorld and STLGears options may fit better.