I've been looking at using a Hot knife instead of an Xacto Knife, as last time It felt like I broke my finger after cutting for 20 minutes, and after looking at options I'm having trouble finding out where to get a hot knife tip for a soldering iron by itself as all I seem to find are with the soldering iron as well. Does anyone know a store or somewhere reliable online where I could get one or 2? Also, the last question I have is, what kind of cutting mat should I use when using a hot knife? All I seem to be able to find are just plastic sheets and to me a hot knife would cut through it easily.