The world’s first community of 3D-printed homes will be built in California, US. The Palari Group said it plans to develop the 20,000-square-meter area into a community of 15 eco-friendly homes. All of them will be 3D-printed. The company says that by using 3D-printing technology, it can reduce 99 percent of building waste. It will also try to make the project more environmentally friendly by using solar energy (太阳能) and green materials.