"We’ve seen 3D printers before, but none quite this ambitious. Italian inventor Enrico Dini’s D-Shape is on a scale large enough to print entire buildings out of simple components: sand and an inorganic magnesium-base binding material."
http://mashable.com/2010/04/21/d-shape-sand-printer/
http://www.physorg.com/news190873132.html
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