But now, Austin, Texas-based construction technology startup ICON and San Francisco-based nonprofit housing organization New Story may have at least part of the answer to the world's affordable housing problem. \"Approaches to construction hadn't changed in so long it was like people had forgotten how to even imagine a different way,\" Ballard explains. AdvertisementAdvertisementOn-site Home PrintingThe key breakthrough was development of the Vulcan 3-D printer, a gantry-style device that moves on rails to build the home, layer by layer. Ballard says the printer is lightweight and designed with minimal bells and whistles, making it rugged and dependable. Ballard says that 3-D printing is the way of the future in home building, and not just in developing countries.