Designed this to crush cans.

The inside is 94mm across from flat side, to flat side, there seems to be a lot of variation in the size of the weights, so make sure yours fits before printing it.

The idea is that you just stick a 15lb dumbbell and push, but it ended up being more effort than expected.

It does get easier as you use it and the print ridges wear down, but there are some issues with the weight binding at first if you pit it in crooked.

It relies pretty heavily on strong layer adhesion to stay together.

I printed mine with 10 walls, and it has held together pretty well.