This is an old design, but figured I might share it. The can crusher by ColgS3b is nice, but I noticed sometimes, depending on how the can crushes, it can get stuck. So I modeled this up to be inserted through the bottom to help eject the can. Sometimes it can require a good smack. ;) 4 perimeters with a strong vertical infill (such as honeycomb) should make it quite sturdy.
The author remixed this model.