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SHANGHAI, CHINA - JUNE 02: (CHINA OUT) 3D-printed items are seen on the Fourth World 3D Printing Technology Industry Conference & Expo at Shanghai World Expo Exhibition and Convention Center on June 2, 2016 in Shanghai, China. More than 132 enterprises participated the exhibition , bringing various devices of 3D printer, 3D materials and 3D service.(Photo by VCG/Getty Images)

SHANGHAI, CHINA - JUNE 02: (CHINA OUT) 3D-printed items are seen on the Fourth World 3D Printing Technology Industry Conference & Expo at Shanghai World Expo Exhibition and Convention Center on June 2, 2016 in Shanghai, China. More than 132 enterprises participated the exhibition , bringing various devices of 3D printer, 3D materials and 3D service.(Photo by VCG/Getty Images)