We further evaluated the influence of LAP concentration, and the intensity and wavelength of light used for crosslinking on the inks' printability (Supplementary Information, Figure ). A 5%GelMA-0.1%CBP ink with 0.05% LAP, 10-fold lower concentration than the amount used in the inks described above, presented adequate viscosity for extrusion. This highlights the impact of the ionic strength on the properties of CBP-based gels, given that the ink with the same concentration of GelMA and CBP but 0.5% LAP flowed and was not extrudable (Figure ).