Apis Cor, a San Francisco startup, is perfecting the printed, insulated concrete house. The video released in February 2017 shows big improvements over video from last year. Structural voids formed with polymer concrete can be foam insulated, the exterior finish is smooth enough to apply paint with a roller. The shapes are wonderfully flexible, accurate, and can be put together in a day. That includes a flat roof and extra man hours to set windows into place and completed for 70% less money. I'm in the business of fabricating roof trusses and before seeing this video, had been spouting off earlier today about looking ahead to some decades of a similar market before the roof truss business joins cooperage at the roadside of life. NOT.
Caution: There's a blitz of cutesy promotion near the front end of the video but lots of detail follows. For example, they put up a tent and build the show home in 24 hours in -35C weather.