MyCera is a composite material made from clay, wood sawdust and mycelium. Using mycelium as an intelligently oriented fiber reinforcement increases the structural performance of 3D printed unfired clay elements and allows for bio-welding of fired clay elements after assembling. The interdisciplinary research combines digital fabrication with the use of mycelial growth to manufacture high-performance and versatile – here static and heat-insulating at the same time – building components that gradually allow a substitution of cement-based binders in the construction process.