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July 1, 2015

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A designer walks over to check the 3D printer, rear, as he passes part of a printed canal house, left, in Amsterdam, Netherlands, on Thursday, March 13, 2014.

Peter Dejong / AP

A designer walks over to check the 3D printer, rear, as he passes part of a printed canal house, left, in Amsterdam, Netherlands, on Thursday, March 13, 2014.