Old classics get a new twist in 2013. Trend one: 3D printers will go mainstream. CNET's Dan Ackerman: "One of the things I've been really surprised about is how quickly people are getting into the idea of 3D printing . That is, the printer that instead of using ink on paper kind of uses a plastic wire to literally knit things in 3D from plans that you either make yourself or you download from the internet. "
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