hot wire foam cutter.

   Tools glad to have built.  Built a hot wire foam cutter for long cuts a few years ago and gave it a solid work out last night.  Very glad to have it.  3 furring strips(2 complete and 1 chopped into various pieces, a piece of rope in a loop and twisted together as a tensioner, about 10 feet of baling wire, 2 nuts and bolts and 2 big wood screws so not terribly complicated.  

Running it off the big battery charger.  Draw just short of 60 amps when running.  

Lay the sheet over a 2X to have room for the wire to fall out the bottom. Set the wire on the marks on top.  Turn the charger on.  About a 30 second delay while the wire gets hot enough and about another 30 seconds while the wire melts its way down through the 2 inches of foam.

  No real mess and factory straight lines even cutting bead board.  This will be the 4th time I have used it in the last 3 years.  

  But cutting foam to firmly fit holes it was amazing.  Cut a slight loading taper and about 1/8" to 1/4" oversize and the foam fits tightly with almost no breakage.

Thanks for the tips, that is a precise way of cutting