3-D printing in plastic is so last year. At this year’s 3D Printer World Expo, companies showed off new machines that print in rubber, metal and even wood. From Burbank, California, the WSJ’s ... more 
3-D printing in plastic is so last year. At this year’s 3D Printer World Expo, companies showed off new machines that print in rubber, metal and even wood. From Burbank, California, the WSJ’s Michael Kofsky shows his favorites. less 
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Wed, Mar 5, 2014 5:10 AM EST