hand drill cover for 555motor

thingiverse

for 555motor, double bearings, with cooling fan D=35.7mm, L=57mm mount hole 2x M3, 25mm cylindical symmetry on the back cover, there's a 15mm hole for DC connector, and another 7mm hole for a tiny governor. i printed with a PETG which gave me a little bit more deformation on inner holes, for this case PLA print can have 0.4mm gap on diameter. With PETG print, you just manually push to fit the motor, but with PLA, you may need to add some tape to fullfill the gaps.