Just saw a guide on building your own hot-wire foam cutter, thought it might be useful to anyone thus inclined towards foam-based terrain and a disrespect of their own personal safety https://hackaday.com/2018/02/08/build-a-tiny-hot-wire-foam-cutter/
Cute, but why not go all the way and build a decent cutter Runs straight off an old cell phone charger. Robert
Mine is similar to that one. Powered by an old plugpack charger. Puts out 11.5vDC @1a (I made it back in the dim, dark past before cellphones (well, before I had one, anyway. It's had the wire replaced twice in 20-odd years). The nichrome wire is available in packs from Jaycar electronics stores in Oz (cat. WW4040).