i need some thing to cut plastic easily and precisely
go to the Make a Hot Knife using a soldering iron instructable and that is it
I had a few ideas on how to do this, however I happened to stumble upon this and I knew I had found your answer!
I don't know if you can find it out west or not but radioshack (now "the source")
has a kit for 20-30 cad that has a soldering iron with a bunch of extras including a hobby knife holder
as a bonus it also has a cheaply made RS quality soldering gun XD
I don't think such tool commerensaly exist, I read there was one DIY'er made his own by welding a x-acto blade onto a soldering tip and use it on the soldering iron.
great answer, although i cant find the instructable. the only one i found was the kind of bad soldering iron tip into knife kind of thing. he just stamps the end flat.
Unfortunately, he did not make an instructable, I saw his project on Makezine.
just a quick google search gave me:http://www.hobbylinc.com/htm/xac/xacx73780.htmand:http://www.amazon.com/Xacto-X73780-Precision-Soldering-Knife/dp/B000BRBZUGmy brother got one of these about a year ago for cutting foam, and depending on the thickness of your plastic, they should do pretty well. we used it with .030 abs, and it didn't cause us many problems, that i can remember.
If your not cutting a whole lot, you can heat up the blade of a normal x-acto knife with a candle or something similar and use that. Be careful not to burn or cut yourself though.