The Bay Area-based "additive manufacturing" company (that's what engineering-level 3D printing is called these days) made the fully functional bicycle as a proof-of-concept to show that the thermoplastic material, laser-heating, and robotic 3D-printing process can be used to replace metal parts for defense companies, airplanes, fighter jets, electronics, and more. Basically 3D printing doesn't mean chintzy plastic figurines anymore. Read more...