Behrokh Khoshnevis, an engineering professor at USC, reveals his Contour Crafting fabrication process system, by which buildings, including plumbing and electrical utilities, can be built using what is in essence a large-scale 3D printer. Khoshnevis presented a scenario in which a 2,000-square-foot house could be completely framed in 20 hours, with lower construction costs than in conventional building methods.