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I think I would opt to mill stiff styro foam or even plastic vs metal. Should you want to carve out complex shapes like a hand or even eyes you are bound to break a tool or two using metal as opposed to plastic. As far as undercutting is conserned that is the reason that some machine shops will require 4 and 5 mill ops to complete a part. Also depending on the part it may require 20 or even 30 different tools.
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