Something that munches plastic?

I need something that will utterly cut through and shave plastic down.
All I have are exacto knives, and they just don't seem to cut it!
BUH DUM TISS
I'm trying my hardest to shape a few legs out for poor little legless PCC mudslinger. All I have to work with is one really torn up DOTM Skyhammer though.
My point is, I need something that will cut through plastic with ease and precision. Any sort of tool out there like this? Would a dremel tool work?
All I have are exacto knives, and they just don't seem to cut it!
BUH DUM TISS
I'm trying my hardest to shape a few legs out for poor little legless PCC mudslinger. All I have to work with is one really torn up DOTM Skyhammer though.
My point is, I need something that will cut through plastic with ease and precision. Any sort of tool out there like this? Would a dremel tool work?