I need to trim a piece of 1/8" plastic that's been vacuformed. What's the best bit to use and how do I do it without melting or gumming up the bit. I've cut tubes and things using a composite wheel in my Dremel but have never cut large piece like this. I'm still getting the hang of using the thing. :confused Ideally I'd like to use a band saw but this is all I've got. Any pointers or what not to do would be great. Thanks in advance.