While there are all sorts of ways to build a hot wire foam cutter, this design from [jasonwinfieldnz] is both interesting and imitable. If you don’t already know it, nichrome wire is nifty stuff ...

This is a very basic boxcutter design, available for purchase at any home improvement store or big box retailer department ..

EDM Network has introduced a new single-axis horizontal submerged EDMMax 1100HW electrical discharge machining (EDM) machine.

Those stick-type hot wire cutters from the craft store that plug into the wall aren’t much better than a knife. The actual cleaving of foam is easier, but dragging a long, hot flexible wand ...