Here is a real simple tool that comes in real handy when doing cutout and sizing the wax to fit inside frames.
It is just a piece of wire twisted between two pieces of wood. I attach the wire to the transformer of my wire embedder and have a rotatory switch to turn it on/off. It cuts thru the wax almost as good as a hot knife thru butter. I seem to be able to do less damage with this than with a serrated knife.