Just made this simple guide for stripping wires and cables for scrapping copper. It needs to be bolted down with 5mm screws, then you just use the hole above to guide the razor blade and pull the wire through.

Small model is for 3, 4, 5, 6, 8mm wires and big model is for 10, 12, 14, 16, 18mm.

I included openscad files so you can customize it for your wire diameters, blade thickness, bolts and over all size.