How do I make a foam cutter?
I am not disputing what has been written before. I will describe what I use. I made my bow 20 years ago and am still using the same one. It is a 45" bow, It does have nichrome wire and I run it directly from a 10amp car battery charger. It draws about 5amp in use. The wire stretching is not an issue. The bow "legs" Are 3/16 dia music wire in tension. They keep the cutting wire tight. Nothing could be simpler to use. I plug the charger in to the household circuit an cut foam.
Ed S