Spur Gear
Involute gears with any number of teeth
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About this generator
Two gears mesh when they have the same module. Their centers are module × (teeth₁ + teeth₂) / 2 apart.
How to use
- Choose teeth and module.
- Set the bore for your shaft.
- Turn on the mating gear to print a matching pair.
Printing tips
- Print slowly with 100% infill for strong teeth.
- Nylon or PETG gears wear much less than PLA.
Helpful guides
Frequently asked questions
How far apart should two gears be?
Center distance = module × (teeth of gear 1 + teeth of gear 2) / 2. For 20 and 40 teeth at module 1.5: 45 mm.
Which module should I use?
Module is the size of the teeth. Two gears only mesh if they have the same module. 1 to 1.5 suits most small printed projects.
