868 molded ours with a rubber compound.
first we milled out the mold from aluminum (which is probably the hardest part of the operation)
then we got a 2 part rubber mixture, mixed it, and poured it in (we used one of
smooth on's products)
last we put it in a toaster oven to speed the reaction up, then popped the rollers out after 30-60 mins.
Very easy to make (once you had the molds), and easy to mass produce.
Good Luck!
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