Check out lindsay books, theres a how to on an plastic injection molder setup, one of Vince Gingery's books. Dave Gingery's books are excellent even if your not going to build the lathe or machine shop stuff some of the detail and casting ideas are worth the purchase. You can easily cast low density and high density plastics, the easiest to get is plastic milk cartons. Its all in the book. Last i looked it was only $9.99us.
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Have a good one.
Dave |