There's an interesting post discussing Qingdao Unique Products Develop's new huge (12x12 meter) 3D printer, unveiled during a trade show in China. The company says that in the future it will be used to print buildings. The printing material is said to be a fiberglass-graphene composite which should enable it to create very strong objects.
The first task for this printer is to print a replica of Beijing's Temple of Heaven. The replica will be 7 meters in diameter, 8 meters high. It will take about 6 months to print.