Stock Photo - 10 December 2021, Saxony, Chemnitz: Sandra Gelbrich, head of the research area ""Lightweight Structures in Civil Engineering"" at TU Chemnitz, and working group leader Enrico Rudolph follow the production of a concrete flyweight arch using an automated 3D printing process. The scientists at the Institute of Lightweight Structures at Chemnitz University of Technology have been researching automated additive manufacturing technologies for five years. Recently, they presented the world's first 3D-printed concrete flying buttress. A special fiber-reinforced concrete formula is applied in several layers by a robot. The Schwibbögen are 120 centimeters wide, 60 centimeters high and weigh 14 kilograms. They serve as reference objects in the development of innovative technologies for the efficient production of lightweight concrete elements with fiber reinforcement. Photo: Kristin Schmidt/dpa-Zentralbild/dpa. - Chemnitz/Saxony/Germany