The first step was to print our standard cylinder and mesh where we found that all these formulations had acceptable shape fidelity and reproducible printability (Figure , Supplementary Information, Figure ). The ink with the lowest GelMA concentration (1%) was used to test the lower limit of total solids that provided adequate printability, since this ink had a water content of 98%. We observed that with this formulation it was possible to print mesh-like constructs and achieve acceptable shape integrity and printability. In the case of the cylinder, the construct could be printed but deformed under its weight when we tried to handle it, showing that tall structures (1 cm) were not structurally sound and easily deformed. Nevertheless, the construct was stretchable (Supplementary Information, Figure ), indicating that there was enough crosslinking in the GelMA network to provide cohesion to the soft material and to allow printing of low-profile structures.