AMSTERDAM, The Netherlands — 3-D printers have been used to make guns, shoes and even prosthetic limbs, but now two architecture firms hope to print the world’s first livable homes. One of the companies says it’ll start building a traditional Dutch canal house later this year. The other plans a more abstract design to be built by an Italian printer. It fuses sand and ground rock — cheap, abundant materials that could yield low-cost housing for the poor.
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