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Gear 3D Models: STL Files for Mechanical Parts

This collection gathers gear-focused 3D models for 3D printing, from replacement parts to kinetic toys and decorative rollers. You can compare how each design handles teeth, shafts and mounting. It is a starting point for finding an STL that matches a mechanism you want to build or repair. 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11日

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«Gear 3D Models: STL Files for Mechanical Parts»

Gear models range from single replacement wheels for tools and appliances to multi-part gearboxes, planetary sets and hand-cranked mechanisms. Some files are modeled as static display pieces, while others include moving axles, frames or fidget elements. Decorative rollers and stamp-like shapes form another group, often built around cosplay props rather than mechanical drives.

When choosing a gear model, check the tooth profile, module or pitch, bore diameter, hub shape and overall thickness on the author's page. Look at whether the file is a single part or an assembly, how many pieces must be joined, and whether supports or post-processing are needed. The material and settings the author lists, along with photos of real prints, help you judge how the teeth and thin sections may come out on your 3D printer.

To refine a search, try terms such as spur gear, helical gear, planetary gearbox, worm drive, rack and pinion, replacement gear, or mechanical toy. Related topics include fidget spinners, automata, marble machines, engine models, and parametric gear generators. Adding a device type, tooth count, or shaft size can narrow results, while broader words like mechanism or transmission bring in larger assemblies.

FAQ

よくある質問

What file formats are common for gear 3D models?
Most listings use STL, though some authors also provide STEP, OBJ or native CAD files. Check the model page to see which formats are included.
What measurements should I check before printing a gear?
Check the tooth profile, module or pitch, bore diameter, outer diameter and thickness. These dimensions matter more than the visual shape when a gear must mesh with another part.
Do gear models need supports?
It depends on the orientation and overhangs. Many flat gears print without supports, while assemblies with axles or frames may need them; the author's page often notes this.
Can gear models be scaled?
Scaling changes tooth size and spacing, so a scaled gear may not mesh correctly with the original design. If scale matters, look for a parametric or generator-based model where dimensions can be set.
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