I made a catalyzed silicone rubber mold using a Coyote Skull and then poured a molten metal alloy made out of tin and bismuth. The result is a 5lbs solid metal skull doorknocker. Parts of the coyote ...

Pouring molten metal into three-dimensional molds to make metal parts is the basis behind both sand and investment casting. But there are significant differences between these two methods. In sand ...