[Chris] finds the average price of rock tumblers insulting ... If you prefer using balls, check out this homemade mill.

If you’re reading Hackaday, there’s a good chance you had a rock tumbler in your younger days ... Pulsing the electromagnet pulls down the large 3D printed spring, which imparts not only ...

I used rock tumblers to make sea glass. Tumbling glass in a rock tumbler allows you to make your own sea glass in just 3-5 days.