3D printing technology faces major issues when it is required to leave the shelter of a warehouse and step foot on a construction job site.  3D printers are extremely large, heavy, and rely on precise calibration for accuracy.  Even the first 3D printed office building in Dubai, which was completed last year, had to actually have its components printed off site and assembled on site. But, Apis Cor, a 3D printing company, believes it has created the technology to print a full structure completely on site.