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Carbon3D leverages a proprietary technology called continuous liquid interface production, or CLIP, which is similar to stereolithography, or SLA, in that a pool of UV-light-sensitive resin is selectively cured with a UV laser to build objects one layer at a time. But instead of pausing between layers like SLA does, which creates rougher surface finishes and reduces printing speed, CLIP controls the flow of oxygen to the resin, enabling it to continuously “grow” objects with an “animation” sequence that the UV laser follows during the printing process.

Read more at: http://www.fool.com/investing/general/2015/04/05/the-future-of-3d-printing-just-arrived-3d-systems.aspx