工具・機材

Gear wheel 3D models: STL files for mechanisms

This collection gathers STL files for gear wheels, planetary assemblies, fidget gears and replacement parts. It helps you find a starting point for 3D printing mechanisms, from simple spur gears to multi-part gear trains. Check dimensions, tooth profile and assembly notes on each model page. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

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選定基準：Polyzon編集部 · 本文の更新日：2026年10月13日

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«Gear wheel 3D models: STL files for mechanisms»

The models range from single spur or helical gears to planetary sets, differential units and fidget-style gear rings. Some are designed as replacement parts for appliances or tools, while others are demonstration pieces with exposed teeth and moving parts. Parametric generators let you change tooth count, module and bore, whereas fixed models come with set dimensions.

Before printing, review the tooth profile, pressure angle, module or diametral pitch, and the bore or shaft diameter. Check how many parts need assembly, whether the author calls for supports, and which material and layer height they used. Photos of real prints can show whether the teeth mesh cleanly and whether the moving parts have enough clearance.

To narrow the results, search for related terms such as spur gear, helical gear, planetary gearbox, differential, rack and pinion, or gear generator. Add the intended use, for example kitchen appliance, robot vacuum, or toy mechanism, to separate functional parts from decorative or fidget models. You can also combine a gear type with a format or design trait, such as parametric, herringbone, or internal gear.

FAQ

よくある質問

What is the difference between a spur gear and a helical gear?
Spur gears have straight teeth and are simple to model; helical gears have angled teeth that engage more gradually. Both types appear in 3D printing collections, and the choice depends on the mechanism and the space available.
What should you check when choosing a gear module or pitch?
Match the module or diametral pitch to the mating gear, then check tooth count and center distance. If you are replacing a part, measure the original gear and compare it with the model dimensions.
Do gear models need supports when printed?
Some gear profiles print with the axis vertical and no supports, but overhangs, bores and mounting features may need them. Check the author's print orientation and settings.
What should you check before printing a planetary gear set?
Look at the number of parts, the assembly order, and the clearances between gears. Confirm the input and output shafts match your project dimensions.
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