Coroplast Plastic Cardboard Safety Cutter

This is a tool that combined with a standard single-edge 39x19mm razor blade can rapidly and safely slice a Coroplast sheet centered in the extrusion flute. Created for use building my heat recovery ventilator project at http://hackaday.io/project/2517-Entropy-Wheel-Heat-Recovery-Ventilator.
*** NEW Arrival: the cross-cut blade. Made for cutting "across the grain". Still printing first draft to test.