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3D Models of Gears and Gear Mechanisms

This collection gathers STL files for gears and gear-driven mechanisms, from simple spur shapes to planetary assemblies and fidget rings. You can use it to find a starting point for a repair, a desk toy, or a mechanical study. Check the author's page for the exact scale, part count, and recommended material before you slice. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

このコレクションの本文は英語で書かれています。検索自体はどの言語でも使えます。

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選定基準：Polyzon編集部 · 本文の更新日：2026年10月14日

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«3D Models of Gears and Gear Mechanisms»

Gear models range from single components to complete mechanisms. Planetary sets combine a central sun gear, planet gears, and an outer ring, while differentials split or combine motion between two outputs. Fidget-oriented designs often use rings, spinners, or print-in-place joints, and parametric generators let you adjust tooth count and module before exporting.

When choosing a model, look at the listed dimensions, tooth profile, and whether the parts are meant to move after printing. Check the number of separate pieces, the assembly steps, and whether supports are needed for overhangs. The material and settings the author lists matter for clearances, especially on small teeth and moving joints. Photos of real prints can show how the mechanism fits together.

To refine the search, try synonyms such as cog, sprocket, pinion, and gear train, or related terms like planetary, differential, and fidget. You can also search by function, for example reducer, drive, or demonstration set, or by shape, such as helical, herringbone, and elliptical. Combining a mechanism type with a format like STL or 3D printing narrows the results further.

FAQ

よくある質問

What types of gear models are included?
The collection covers single gears, planetary systems, differentials, fidget rings, and parametric generators. Many entries are mechanical toys or educational examples, while others are replacement parts or decorative shapes.
How do I choose a gear model for a project?
Check the model page for module, tooth count, pitch diameter, and overall size. Compare those values with the parts you already have, and review any assembly notes or photos of printed versions.
Do gear models need supports?
It depends on the orientation and overhangs in the file. The author's page often states whether supports are required and where to place them.
Can I scale a gear model up or down?
Scaling changes tooth size and clearances, so a mechanism may not work after resizing. Check the author's notes for any recommended scale or test prints.
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