Stackable 4:1 Planetary Gearbox – 3D Printable Mechanism

Stackable 4:1 planetary gearbox – printable mechanism for STEM, demos, or kinetic projects!
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updated May 13, 2025

Description

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Explore gearing and mechanics hands-on with this modular, stackable planetary gearbox!

Designed with a 4:1 ratio, this 3D printable gear system lets you stack multiple units together for greater gear reductions and complex builds. Perfect for hobbyists, tinkerers, educators, and anyone who loves mechanical projects!

⚙  Prints support-free — recommended in PLA or PLA+ for strength.
🔧 Parts slot together 
📏 Standardized shaft and gear sizes for easy remixing or customization.

📦 Tip: Stack two or three units together for extreme gear reductions!

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🎥 YouTube: @VogMan

 

This is a 4:1 stackable Planetary Gearbox, designed with just enough slack in the system to mean it should work perfectly first time. I've printed a few other such gearboxes from Thingiverse and couldn't get them to work because the tolerances were too high... this shouldn't be a problem here. Stackable means you can print two or more gearboxes and insert them into each other, increasing the overall output ratio, ie 4:1, 16:1, 64:1, etc. I've included printing instructions (though it is a VERY easy print - no supports required) and the video below demonstrates how things are easily fitted together.

WANT TO TIP?
My design for these planetary gears was inspired by a build by PCGEAR https://www.thingiverse.com/thing:3047454 and whilst mine was a completely separate build, I still feel that if you're good enough to want to give a tip, it should go to him. If I hadn't seen and tried his version, I would have never made my own. So my thanks go to PCGEAR for the inspiration.

JUST ONE STIPULATION... if you feature this in a YouTube video, please name me and provide a Link to this file AND to my YouTube Channel

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The author marked this model as their own original creation.

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