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You need to cast your object first. You may want to look into a product
by Ferris for making molds. It is first poured around your object, then
placed in an oven (even your home oven will work}. The baking step
produces a clear mold that enables you to see where it should be cut.
I've found this product to be useful when I don't need to make large
numbers of impressions, say 50+.
I've found it available at most jewelry making supply sources.
Joyce in Colorado