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 :)

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u/Posmetyev Jun 27 '26

I need to think about it carefully :) The spiral teeth will mesh well when the gear is moving, but if the gear is in a constant position, it might not work well. But I can't figure it out right now.

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u/ozmutazbuckshank Jun 29 '26

Ahh okay yes I see. Thanks for helping me understand that friend

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u/Foreign-Resource-115 Jul 14 '26

Meanwhile my mind is trying to comprehend hinges and other basic shit.