Justyna Stec joined TRR 277 as a guest Master’s student from Wrocław University of Science and Technology (PWr), collaborating with project A04. During her stay at TU Braunschweig, she worked on Shotcrete 3D Printing (SC3DP) of concrete modified with spent catalyst and fibres. Her research involved preparation of specimens to investigate hardened material properties tested later at her host university, and a shared analysis of results. The work carried out within TRR 277 formed the basis of her Master’s thesis, and is now being continued as part of her doctoral research at Wrocław University of Science and Technology.