[Greenbuilding] Printing homes?

[sanjay jain]

http://news.yahoo.com/blogs/sideshow/3d-printer-could-build-house-20-hours-224156687.html

An engineering professor, Behrokh Khoshnevis, at the University of Southern California,  is really thinking big: He  
has figured out a way to build housing with a  giant 3D printer.
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