Purrbox

The two sides spin on a bearing while the opposing magnets move past one another with a slight bump. There are 19 magnets on the base and three in the lid.

Requires one 608 bearing and 22 neodymium magnets that are 6x2mm.

Assembly requires no glue - all parts press together although the magnets might require a hard, round tool to push them in and flatten them. You can easily remove the magnets if needed because there is a small gap above the magnets you can use to pry them out. However, the bearing will be very hard to remove.

I included a second top with a slightly smaller bearing cup that fits more tightly (Purrbox Top sm). I don't know why, but the larger one fits perfectly with one filament I used but was too loose with a different filament. The second one fit perfectly with the other filament I tried.

You could use the slicer to cut out just the middle portion and print it to see which one fits better using your printer and your filament.

I experimented wit