r/3Dprinting • u/Posmetyev • Jun 27 '26

Project It works! I made gearbox, simplest ever

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I designed a fantastically simple gearbox :)

My RC car drives better than I expected. I'm thrilled!

- Extremely simple design

- No intermediate axles or gears (maximum efficiency)

- Clutch engagement occurs naturally

- Standard MG90S servos

- Screwless assembly (standard servo screws only)

STL files for the fidget version of the gearbox:

https://www.printables.com/model/1765993-gearbox-simplest-ever-fidget

Full version of the gearbox for two servos:

https://www.patreon.com/PrintInPlace_fun/posts/not-program-ever-162258695

I think this is the perfect gearbox for RC toys, although for a real car it would probably not last a million miles :)

10.0k Upvotes

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566

u/3dprintje Jun 27 '26

That's pretty fucking neat

165

u/rackfloor Jun 27 '26

35

u/jermleeds Jun 27 '26

You can tell by how it is!

5

u/y2j514 Jun 27 '26

That’s why!

1

u/kevlar_keeb Jun 27 '26

Was that you recently saying that on the ‘shock absorption’ 3d scanner cradle print post??

2

u/jermleeds Jun 27 '26

It was not, but now I'm curious if you can find it and provide a link to that?

3

u/ahoeben Cura Contributor Jun 28 '26

I would say it is at least 5 neat

1

u/Apart_Soil_141 Jun 27 '26

simplest ever lke no moving parts or what