Additive manufacturing has been on the tip of every techie's tongue for years. But in 2013, it was finally at our fingertips, too.  Last year marked the 30th anniversary of the world's first 3-D printed part, and the industry celebrated by bringing additive manufacturing straight into the global mainstream. In 2013, we saw machines pop up everywhere from SkyMall to the neighborhood library while printing services expanded from high-tech boutiques to UPS and Staples. Even ...

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