One-piece (no assembly) stackable planetary gear box

thingiverse

This is a modified version of the gear bearing by emmett [1]. It is designed to act as a gearbox that could be printed in one piece (i.e. preassembled). The changes include: adding pins and output shaft to the planets, adding extra sleeve on the housing to allow stacking of the same gearboxes. adding fillets and chamfers to help print and prevent fusion of the first layers. print with 0.2 mm layer height, 0.4mm nozzle and 30% infill worked fine for me. print without support! Pro tip: after printing, carefully rotate the sun to debond the gears. Then use a drill or any fast rotary device to rotate the sun gear in high speeds. Afterwards, add a little oil to the gears and the pins, and drive the gearbox again. Once it is loose enough, connect the drill to the planets shaft and drive it again a few times in both directions. This way you will get a nice smooth gearbox with very low friction. [1] https://www.thingiverse.com/thing:53451