Hot wire foam cutter

I want a hot wire cutter, mostly for cutting wings and fuselages for RC airplanes, but it will be useful for other projects as well. The power supply will be unregulated, variable, and suitable for wide range of wire sizes and lengths. It needs a current and voltage display and adjustment. It can output up to 140W, with up to 22V and up to 20A. The bow is needed for very thick cuts. I mostly need this for cutting endwise into foam sheets to cut wings. This needs to be capable of cutting 3 feet, so the bow will probably be about 42 inches. The table is the more traditional format, with the wire coming straight out of the table for making perpendicular cuts in foam up to several inches thick. The supply can also be used with a rigid wire cutter. That is, a thicker wire bent into a cutting profile and mounted on a wand for carving.

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