[wagonman76]

Dremel tool works well for me. Nothing else I can think of that works better. I use the thinnest wheel and low speeds to keep it from melting very much. Feed the wheel in light, short pulses. Don't push hard or for too long or you'll start to melt it. Then as McTimson said, the little bit that melts on the downstream side of the cut can be just pushed away once it hardens after 10 seconds or so.