Free No account needed

STLGears

Free 3D gear generator with eight gear types and no account needed

STLGears is a free browser tool for quick single gears for repairs and school. Free, optional Ko-fi donations. Exports STL; no account needed. Last checked .

Open STLGears See alternatives

Opens stlgears.com

Screenshot of STLGears

What is STLGears?

STLGears is a free gear site run by a developer named Juan and supported by Ko-fi donations. It keeps things simple: open the 3D generator, choose a gear type, fill in the numbers and download an STL ready for your slicer, with no signup.

Eight gear types are available, ranging from plain spur gears to bevel gears, double helical gears and internal ring gears, which is enough to build a planetary gearbox. A separate 2D generator exports DXF files for laser cutting, and STEP export for CAD users was announced but not available as of September 2026. The site also has a theory section that explains how gears work, which helps if terms like module and pressure angle are new to you.

Supporter comments on the homepage come from teachers, students and hobbyists fixing toys and appliances, which sums up who it is for. It is a good first stop for anyone who needs a gear quickly.

What you can make

  • Spur gears
  • Bevel gears
  • Double helical gears
  • Internal ring gears

How to use STLGears

  1. Open the 3D gear generator
  2. Pick a gear type
  3. Enter teeth, module and dimensions
  4. Download the STL

What you'll need to print it

Filament and parts that suit what you make with STLGears.

PETG

M3 heat-set inserts

M3 screws

Also handy

Digital calipers

Filament dryers and dry boxes

Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that

STLGears pros

  • Free with no account
  • Eight gear types including bevel and ring gears
  • Built-in gear theory pages

STLGears cons

  • No STEP export as of September 2026
  • No gear train simulation

Read next

STLGears alternatives

Gear, knob and part generators
Screenshot of GearGen-3D

Mechanical Parts

GearGen-3D

Free open-source browser generator for seven gear types, with involute teeth and STL, STEP and DXF export

Free Browser STL · STEP New

Mechanical Parts

Gear Generator by Koolm

Spur, ring, bevel, crown and worm gears plus racks, all from one MakerWorld form

Free MakerWorld STL · 3MF
Screenshot of Neo Gear

Mechanical Parts

Neo Gear

Free spur and helical gear generator with profile shift and keyed, D, hex or square bores, as STL or 3MF

Free Browser STL · 3MF
Screenshot of alpaco.it Gear Generator

Mechanical Parts

alpaco.it Gear Generator

Meshing spur, helical or herringbone gears set by module and teeth, with shaft fittings

Free Browser STL · 3MF