What in the world do you use to cut plexi-glass? I used a scroll saw and if I stop the heat melts the plexi back on itself. I have broke 2 blades trying this method. Then tried a jig saw, same thing, melts the plexi-glass and you can only do real small pieces at a time as I need to break the piece off fast before it completly hardens again. Please tell me there's a easier way.