or CBP (Figures ) concentrations while fixing the other component. The storage (G') and loss (G") moduli of the inks showed a dependency on the concentration of either component (Figures ). Increasing the CBP and GelMA concentrations resulted in a proportional increase of the storage and loss moduli. The trend was more pronounced in the case of CBP, where G' increased ~60-fold with a slight variation in the total concentration of solids (0.1-0.5%), indicating that a minimum CBP concentration (i.e., 0.25%) is needed for the ink to present high viscosity and gel-like behaviour.