A Chinese company has become the first to construct multiple buildings using 3D printers that extrude recycled building materials at breakneck speed. Using four huge 3D printers, Yingchuang New Materials Inc. was able to print the shells of 10 one-room structures in 24 hours and at a cost of only about $5,000 per building. The buildings had to harden at the factory and then be transported and assembled on site.

http://www.computerworld.com/s/article/9249532/3D_printer_constructs_10_buildings_in_one_day_from_recycled_materials