https://www.sciencedaily.com/releases/2022/09/220922103202.htm > 3D printing is gaining momentum in the construction industry. Both on-site and in the factory, static and mobile robots print materials for use in construction projects, such as steel and concrete structures. > A new approach to 3D printing -- led in its development by Imperial College London and Empa, the Swiss Federal Laboratories of Materials Science and Technology -- uses flying robots, known as drones, that use collective building methods inspired by natural builders like bees and wasps.