"The homes are made from concrete, using a machine – nicknamed The Vulcan – that is transportable on the back of a truck, making it a mobile affair.
The printer is set on tracks and squirts out the concrete material in layers to build floors and walls. It hardens as it goes, building a 600- to 800-square-foot single-story home, with two bedrooms, a kitchen, and a bathroom. Everything except the roof is 3D printed"
