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This robot can 3D print a building in 14 hours

http://money.cnn.com/2017/05/02/technology/3d-printed-building-mit/index.html?sr=recirc0714173dprintedbuilding1030vodtop

A giant robot can now 3D print a building.
Researchers from the Massachusetts Institute of Technology have created a robotic system that built the basic structure of a building in less than 14 hours. The dome-like structure is 50 feet in diameter and 12 feet high.
The prototype is essentially a vehicle with a large industrial robotic arm for reach, and a smaller arm for dexterity. Different tools can be attached to the smaller arm, such as a welding system or a spray head that shoots out building materials like foam.
"With this process, we can replace one of the key parts of making a building, right now. It could be integrated into a building site tomorrow," said Steven Keating, co-author of a paper published in the journal "Science Robotics."