3-D printing, or additive manufacturing,1 1.Additive-manufacturing techniques build objects layer by layer, rather than through molding or “subtractive” techniques, such as machining. has come a long way from its roots in the production of simple plastic prototypes. Today, 3-D printers can not only handle materials ranging from titanium to human cartilage but also produce fully functional components, including complex mechanisms, batteries, transistors, and LEDs.
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