My own take on a Cycloidal gearbox, loosely based on this video i saw on youtube: https://www.youtube.com/watch?v=MBWkibie_5I Originally I used printed spur gears to drive it, which worked great until they melted. I ended up purchasing some metal ones instead. The cycloids don't seem to generate much heat at all, and I have not had any problems with the ball bearings heating up. Still, lubricating the ball bearings would be a good idea.

Parts Needed:

Motor Mount 10x 40mm M3 Buttonhead screw 4x 10mm M4 Buttonhead screw 1x 200KV Brushless Motor 10mm shaft 1x 25 tooth spur gear 10mm bore; 20mm step; 1 mod Motormount.stl

Cam x3 1x 25 tooth spur gear 8mm bore; 20mm step; 1 mod 2x 8x22x7 bearing 608ZZ skateboard 3x Spacer.stl 1x Eccentic.stl 1x 50mm 8mm pin 4x 20x27x4 bearing

Cycloid 15x Roller.stl 15x 33mm 4mm pins FrontRotor.stl BackRotor.stl

Drive Plates 2x OutputDrivePlate.stl 104x 5mm ball bearings

Housing BackHousing.stl FrontHousing.stl 15x 35mm M3 buttonhead screw 15x m3 heat set inserts 2x BearingPlug.stl 3x 50mm M3 buttonhead screw

See the shopping list in the files section for some amazon links I used for parts. I cut the 3mm dowel pins to size, and ground a flat edge on the 8mm dowel pins to fit the eccentric part.