Summary

Yet another coin based bottle opener. I'm using a U.S. penny (19mm diameter x 1.5mm thick). It is designed to print flat without supports I recommend 100% infill if you want it to last or maybe printing it in something stronger than PLA. I do use one small bit of support in the middle of the coin slot which is easily removable with a dental pick. Depending on how well your printer bridges, this may not be required.