Haidian district of Beijing is hard at work. Eight machines, the biggest the size of a delivery van, are busy making things. Yet the factory, owned by Beijing Longyuan Automated Fabrication System (known as AFS), appears almost deserted. This is because it is using additive-manufacturing machines, popularly known as three-dimensional (3D) printers, which run unattended day and night, seven days a week. The printers require an occasional visit from a supervisor to top them up with the powdered materials they use as their inks, or to remove a completed item, but apart from that they can be left on their...
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http://www.economist.com/news/science-and-technology/21576626-additive-manufacturing-growing-apace-china-new-brick-great-wall