Wherever the beam strikes the surface, the photopolymer polymerizes/crosslinks and changes to a solid. The light beam, moving under computer control, draws each layer of the object onto the surface of the liquid. "In Hull’s patent, a concentrated beam of ultraviolet light is focused onto the surface of a vat filled with liquid photopolymer. It became widely used in rapid prototyping and direct manufacturing. Hull defined stereolithography as a method and apparatus for making solid objects by successively printing thin layers of the ultraviolet curable material one on top of the other. Hull coined the term stereolithography in his Augpatent application for " Apparatus for production of three-dimensional objects by stereolithography." U.S. ![]() That year he created the first-ever 3D printed part. Hull (Chuck Hull) invented stereolithography, or 3D printing.
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