Revision of Compact Planetary Gearbox by raldrich, I sorted out some tolerance issues I had on the first prints and separated all the pieces since the print has to be really slow and high quality and I can't print for 9 straight hours.
You will need a part of each stl and 3 of the planet_gear.stl to make a whole gearbox. Slow speeds and low layer heights as possible are recommended.
The ratio is 40:9.
BOM as provided by raldrich (I did not print the M6 variation so I won't put that one)
- M3x12 Socket Head Cap Screw
- 4 M3 Nut
- 1 M3x6 Set Screw
- 4 M3x35 Socket Head Cap Screw
- 1 M8 Hex Head Cap Screw o
- 2 608ZZ (8x22x7)
- 1 M8 or M6 Nylok Nut
After the print, sanding was necessary but the gearbox works overall as expected, I didn't test it at maximum torque yet but it looks promising