This makes photopolymerizable HA solutions suitable for 3D printing techniques requiring both high viscosity inks like extrusion printing and low viscosity inks like DLP printing. Successful DLP printing has been reported using 88 kDa HA-NB at polymer concentration of 5 wt%, and 1000 kDa HA-MA at a concentration of 1-2% w/v . Higher viscosity can be problematic for DLP printing by restricting flow away from the cured layers and solution refill in the ink reservoir when the printing platform is raised. For our study, we selected HA with a molecular weight of 40-50 kDa and targeted a polymer concentration of 4% w/v. This composition is in the range of HA based inks relevant for bioprinting. The molecular weight and concentration are lower than those used for DLP bioprinting in other reports. Therefore, viscosity in our solutions was expected to be low enough for DLP.