This process can be used to cut metal, wood and plastic. CNC stands for Computer Numerical Control. Its basically a computer controlled carving machine that can cut many different materials with controlled accuracy
You want to get a good amount of plastic for your opener so you can use it for longer than just one time. A bottle opener made from glass or ceramic would be better, but if you don't have any of those lying around then plastic works just fine!
cutting plastic with cnc bits