I wanted to build something to cut styrofoam for a while but never found the time. Then I decided I to build one out of Lego pieces. Afraid that the abs plastic construction toys would melt I mounted the electrical connections above and below the plastic so that section of the wire would never have current run through. To kept the nichrome wire taut I used a spring I found. The cutter is powered by an external power supply. I have one I built out of a PC power supply and a DC model train transformer from when I was a but a wee bit lad.
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