A villa built by 3D printing technology is seen in the Suzhou industrial park of east China's Jiangsu Province, January 18, 2015. By using the technology, the stand-along villa and a six-story full-sized bulding have been printed out here recently. The walls of these houses were created by giant 3D printers which adding successive layers of material to form the shape. And the material is made from construction wastes. Photo: Xinhua 

A visitor stands in a semi-finished apartment built by 3D printing technology in the Suzhou industrial park of east China's Jiangsu Province, January 18, 2015. By using the technology, a stand-along villa and a six-story full-sized bulding have been printed out here recently. The walls of these houses were created by giant 3D printers which adding successive layers of material to form the shape. And the material is made from construction wastes. Photo: Xinhua

A visitor walks in the villa built by 3D printing technology in the Suzhou industrial park of east China's Jiangsu Province, January 18, 2015. By using the technology, a stand-along villa and a six-story full-sized bulding have been printed out here recently. The walls of these houses were created by giant 3D printers which adding successive layers of material to form the shape. And the material is made from construction wastes. Photo: Xinhua

A visitor stands in a semi-finished apartment built by 3D printing technology in the Suzhou industrial park of east China's Jiangsu Province, January 18, 2015. By using the technology, a stand-along villa and a six-story full-sized bulding have been printed out here recently. The walls of these houses were created by giant 3D printers which adding successive layers of material to form the shape. And the material is made from construction wastes. Photo: Xinhua