Affordable Rock Tumbler - NEMA17 Version
thingiverse
I built an NEMA17 version of J_T_3_D's rock tumbler that works like a charm. To reduce vibrations, I attached a cork gasket and glued rubber feet to the bottom of the frame - it makes all the difference when working on a table or desk. You can find the files for the pulleys and gears as well as the original instructions at https://www.thingiverse.com/thing:935252/.
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