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Stereolithography is an additive manufacturing process using a vat of liquid UV-curable photopolymer “resin” and a UV-laser to build parts a layer at a time. On each layer, the laser beam traces a part cross-section pattern on the surface of the liquid resin. Exposure to UV-laser light cures, solidifies the pattern traced on the resin and adheres it to the layer below. The models are generally clear or solid in color. Anatomical landmarks can be “colored” within the model by manipulating the exposure times.