 This study explores a suitable reinforcement strategy for the egg shell fabrication process, which combines 3D printing of formwork and simultaneous casting of fast hardening concrete. The results show that combining conventional longitudinal reinforcement with fibers as sheer reinforcement is effective, resulting in a volume reduction of almost 50% while maintaining similar structural performance to a beam with a rectangular cross-section. This study highlights the potential of egg shell in producing material-efficient structural concrete elements with an innovative reinforcement strategy. This article was offered by Lukas Gebhardt, Joris Berger, Jamie Matterfalken, and others.