Fig. 9. DCP 3D printing construction robot Massachusetts Institute of Technology recently developed a 3D printing robot of DCP type for construction, as shown in Figure 9. The robot consists of a carrier, a manipulator, a manipulator and a storage device. It uses a nozzle in the manipulator to spray polyurethane foam, which can be cured into building materials in an instant. The six-degree of freedom manipulator is able to move the nozzle in all directions, thus creating buildings that are not limited by size. Experiments have proved that the robot can print a circular wall with a diameter of 15 meters and a height of 3.7 meters within 14 hours.