I am designing a mechanism that needs to cut 3D printer filament (normal 1.75mm). That's all it does. I just don't know how to design one. I've seen automated wire cutters, but filament requires some more force to cut than the wires. Ideally, it would leave a clean cut, but that's not essential. The final design will probably use wire cutters, I just don't know what to use to actuate them. Any suggestions on what to use?