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 ...

A pastry blender, which you’ll also see called a pastry cutter, is used to cut fats into flour. It normally looks like U-shapes of wire attached to a handle, but you’ll also see these sold as ...

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 ...