28 students from 5 countries, 4 tutors and the complete G.tecz team. 1 week masterclass workshop in our lab in Kassel: UHPC, shotcrete, 3D printed concrete and extruded concrete. The students were able to try all the technologies and implement their own ideas. ! Week of experiments, innovation and fun. We would like to thank the organizer Siebe Bakker and the Concrete Information Center, the students and our G.tecz team.