You can make a hot wire cutter using a battery and fine stainless wire pretty easily. I personally wouldn't make a mains-power one unless I knew what I was doing (I don't). If you want it to last a bit longer gut an old toaster for the element wire - it's built to handle the heat. Had a big mains power guillotine style one (built by someone else) for doing hard foam insulation that was fantastic. Worked off a dimmer switch to control temperature and was made out of plywood and plumbing pipe. I suspect it was actually made from a toaster from the parts I could see. Ended up making the smaller hand cutter to cut the insulation to fit around oddball shapes like outlets, studs etc.
Edit - I stand corrected... mains power looks pretty easy https://www.youtube.com/watch?v=SCbEeW_n7OU
On that note - where do people get their foam from? Para Rubber's prices suggest their foam is made from unicorns and pure platinum. There has to be a wholesaler or marine supply that does it for cheaper.
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