Design details can be found here.

Build details are here

A relatively simple tumble polisher. Originally designed for use with a Chock Full of Nuts coffee can, then I decided to make myself a custom can with a more secure lid.

I printed the Base and Tumbler (drum) in PLA and everything else in PETG. For full details on parts I used, see the 'build' link above, but the gist is it takes three roller skate bearings (608-2RS), one 6806-2RS bearing, a Greartisan DC gear motor (or equivalent with same bolt pattern), and some M3 and M4 heat sinks with matching fasteners.