I'm not going to go into too much detail on building a hot wire foam cutter here. There are tons of great instructables and videos already. I am going to show you how my laziness and impatience in building one paid off with a new material to use that will allow you to bend the wire into shapes to cut with.
If you like this, check out my other instructables here.
I also made a video podcast of this below.
Step 1: The wire
Step 2: Basic- Cutting profiles
if you want to cut a specific shape, you can draw or print it on a piece of paper, then use that as a template to bend your wire. For straight cuts, clamp anything straight to the table to act as a race or guide.