New and Improved bottle opener. This opener is much more ergonomic, as well as supporting both US quarters and pennies.
penny-opener.stl - this is the STL for a penny based bottle opener. small, compact, cheap.
quarter-opener.stl - this is the STL for a quarter based bottle opener. bigger, beefier, a bit more expensive.
Simply print it out, insert coin, and enjoy a nice cold beer!