Human figures in the process of being built on a 3-D printing machine equipped with a stereolithography apparatus (SLA) at the National Center for Rapid Technologies (RapidTech). SLA is one of several methods used to create 3-D-printed objects. Instead of extruding ink or some other liquid onto a surface, such as with an inkjet printer, SLA machines begin with an excess of liquid plastic, some of which is cured, or hardened, to form a solid object.
Credit: RapidTech
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