RAY POPE shared on Thingiverse:
This is a rock tumbler I made to bring out the qualities of brass and
copper printed filaments.
It probably spins too fast here so you can either drop the supply voltage to the motor to 9 Volts (which I did and works well) or increase the amount of cutting material (I used zinc plated small screws) inside the
tin with the object to be shined. It takes a few hours spinning to get results but generally works well. The only thing I would add would be a chain guard to keep the chain jumping off the sprockets which I
will design and upload at a later date. As for now this does the job
for me and beats paying $100+ for a commercial tumbler.
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