Hotwire cutter (foam/wood)

This tool I designed is able to cut styrofoam and soft wood (balsa, spruce/pine).
Working part length is ~38cm. You can apply the vertical scaling and modify length of the regular middle part if you need to get other length of the tool (this part could be not used at all, or installed twice).
Power supply is connected to washers on M8 threaded rods, which is isolated from the 12mm aluminium tube by capton tape. Nichrome string is attached to washers, wich is tightened between nuts on the rods.