Can anyone recommend a good caster that can deal with making a mold
from a polymer clay piece, and then do small production runs in
You could try casting a metal master directly from the polymer
piece, or better yet, get your friend to switch to sculpting wax. Not
sure how clean the polymer would burn away prior to casting, but I've
had success with a number of plastics. Then make the mold off of the
new metal master.