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Plastic shredder for shredding plastic?

  1. 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.
     
  2. jcsd
  3. Hello Ian,

    Any plastic is not a good material for this task as all will wear out fast and definitely cannot keep an edge.
    To give you an idea: The lowest steel has a tensile strength of 180 N/mm^2 while the best of the plastics is around 70 N/mm^2 (I do mean a solid piece). ABS has 30-40 and Acrylic has around 60-65. It will wear out in a few passes.

    For holding an edge you need a hard material of which steel is the cheapest one i can think of.
    Seek and purchase something like this in conjunction with some low power tools:
    http://www.clasohlson.com/medias/sys_master/8873729818654.jpg

    and remember to use a face mask as breathing in plastic powder is detrimental to your lungs.
     
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