Rock Tumbler chamber

thingiverse

My Harbor Freight rock tumbler is malfunctioning - the large rubber compartment leaves black rubber residue on my parts. The rest of it functions normally, so I created this compartment to fit inside the original rubber part. The lid is extremely secure and needs to be pried open. Adding a chamfer or fillet might make removal easier, but the printed design works perfectly for me. I added ridges to pull material toward the bottom, which should improve mixing efficiency. The lid isn't designed to be watertight; I assume it would leak slightly into the actual compartment, and that's acceptable.