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Some people request custom 3d jewelry items (STL) to make 3d prints in wax using special high-resolution 3d printers. This is used as a mold for reproducing the object in precious metals. This is often the case for rings, pendants, earrings, etc. Some people might use them just for standard plastic 3d replicas on an FBM printer, and some people use them just as decoration for characters in games or VFX. Depends on the request.
