Rock Tumbler

This is a rock tumbler I made for my mom's X-mas present. Non-printed parts include: a 12v 60 rpm electric motor, a speed controller(probably not necessary), 2 230x10mm metal shafts, 4 26x10mm bearings, 16 threaded brass m4 inserts, 8 m4 25mm hex bolts, a 4.75" x 4.5"(dia) rock drum, and a 12v wall wart with female connector. Print 2 rollers, 2 roller pulleys, 2 supports, and 4 roller bushings. The belt was printed with TPU and is surprisingly tough.

Electric motor: Nextrox Mini 12V DC 60 RP