Increased shear rate (such as that experienced by the ink during extrusion through a nozzle) resulted in a reduction in viscosity, which implies a more favorable conditions for cells included in a bioink during extrusion. In addition, the viscosity vs. shear curves shifted to higher values as the concentrations of GelMA or CBP were increased, with a more significant influence of the latter (Figures ), indicating that the CBP concentration largely dictates the resulting viscosity of the inks. To assess the thixotropic behaviour of the GelMA-CBP inks, the process of extrusion through a nozzle was mimicked by alternating shear rates between 1 and 500 Hz (Figures ).