I am looking into the possibility of making this shredder to shred failed 3D prints, mostly ABS. https://grabcad.com/library/mini-shredder--1 Here is a printed version, which can't shred plastic- https://www.youtube.com/watch?v=A4rg--VEXVM These are expensive to make in steel, but I was wondering if there was a plastic alternative that could at least handle ABS. Acrylic is pretty hard, and I can cut that on my laser cutter. Polycarbonate might work, though I would need to send it somewhere for CNC. What material properties are the most important for maintaining a sharp edge and resisting wear? Hardness? Impact resistance? At the very least it would need to be very stiff so it won't bend when it should shear.