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3D-Printed House Constructed On-Site In One Day (treehugger.com)
Heffenfeffer writes: Russian company Apis Cor has manufactured a 3D printed concrete house on-site in 24 hours in Stupino Town, Russia. Using a tower crane-shaped concrete extruder that can rotate 360 degrees, the 38 square meter (408.88 square foot) rotor-shaped home walls were constructed in one day. Voids left in the manufacturing process were filled by hand, installing windows, doors, and adding polyurethane and fiber insulation to the hollow concrete walls. The roof was also constructed by hand using polymer membranes, welded together using hot air and special equipment. Total construction costs were $10,134 (USD), approximately $266.66 per square meter ($24.78 per square foot). They also constructed a temporary protective heated tent to surround the house as they constructed the house during winter. Though the printer can be used at temperatures down to -35C, concrete has to be at least +5C to cure. Further reading: Designboom Magazine
If you actually watch the video, you will see the machine adds fibreglass rebar already automatically. Also you will see that the exterior walls are printed hollow so you can spray foam inside them afterwards (basically the same concept as ICF except it is 3D printed).
Yes, the framing, siding, and roofing is not the only part of building a house. Obviously you still have interior work to do after the fact. However, it is a very significant portion, and this machine can do all of them in 24 hours (have a bigger house? Use 2 or 3 machines to keep it at 24 hours...). When was the last time you saw a house framed, roofed, and sided in 24 hours? You can't even assemble a factory-built home on site that fast... I know cause I have one.