You won't believe how guy built this!
http://www.cnn.com/video/data/2.0/video/bestoftv/2014/09/02/pkg-minnesota-3-d-printer-makes-concrete-castle.wcco.html
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http://www.cnn.com/video/data/2.0/video/bestoftv/2014/09/02/pkg-minnesota-3-d-printer-makes-concrete-castle.wcco.html
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via my feedly.com reader
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