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3D Models of Gear Reducers and Gearboxes to Print

This collection brings together STL files for gear reducers of several types: worm, planetary, helical and bevel gearboxes, along with cutaway versions and motor-mounted units. It helps when you need a printed reduction stage for a mechanism or a visible model of how gearing works. Since the parts are made on a 3D printer, scale and shaft fit matter from the start. 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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«3D Models of Gear Reducers and Gearboxes to Print»

Worm reducers appear both as complete housings and as cutaway display pieces, while planetary and epicyclic sets are usually assembled from several stacked stages. Helical, bevel and modular gearboxes differ mainly in how their axes are arranged: parallel, crossing or at a right angle. Motor-mounted versions pair a small electric motor with a reduction stage, and hand-cranked models show the same kinematics without any drive.

On the author's model page, look at the stated size and gear ratio, the number of parts and how they go together, and whether supports are needed for the housing or the teeth. Check the material and settings the author lists, because thin gear teeth and long shafts behave differently in rigid and in tougher filaments. Photos of real prints help you judge clearances and whether the parts were scaled after printing.

To narrow the results, try synonyms such as gearbox, speed reducer, transmission or gear train, and add the type you need: worm, planetary, cycloidal, bevel or spur. Related topics include stepper motor mounts, robotics joints and RC drivetrains, which often contain a reduction stage. Adding a ratio, a shaft diameter or a part count to the query usually cuts the list down further.

FAQ

よくある質問

What is the difference between a reducer and a gearbox?
The terms overlap: a reducer is described by its job of lowering speed and raising torque, while a gearbox is described by the housing and the gear arrangement inside it. Many models in this collection are named with both words.
How do I pick a gear ratio for a printed reducer?
The ratio follows from the speed and torque you need at the output, so start from those two numbers. The model page usually states the ratio, and some designs let you change it by swapping one gear pair.
Do printed gear reducers need supports?
It depends on the orientation of the housing and on how the teeth are positioned. Some authors print gears flat on the build plate with no supports, while others show a supported layout; check the notes and photos on the model page.
How is a printed reducer attached to a motor?
Most motor-mounted designs include a mounting pattern and a bore for the motor shaft. Compare the frame size and shaft diameter given on the model page with the motor you have before printing.
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