42 Design and engineering of parts for others made by additive manufacturing, stereolithography, selective laser sintering, direct metal laser sintering or 3D printing; design services for others in the field of additive manufacturing, stereolithography, selective laser sintering, direct metal laser sintering or 3D printing; design and engineering of parts for others made by machining, injection molding, clay firing, or casting; design and engineering of custom parts for others; design and engineering of plastic, metal, wood, ceramic, and paper parts for others; design and engineering of keepsakes, memorabilia, mementos, figurines, sculptures and portraiture sculptures made of plastic, metal, wood, ceramic and paper for others; design and engineering of custom keepsakes, custom memorabilia, custom mementos, custom figurines, custom sculptures, and custom portraiture sculpture made of plastic, metal, wood, ceramic and paper for others; design and engineering of prototypes for others