GelMA. This observation was supported by the numerical values calculated for the printability parameter (Figure ). A significant increase in printability from 0.3 ± 0.1 to 0.72 ± 0.03 (with a value of 1 representing a perfect reproduction of the designed shape) was seen when the concentration of GelMA increased from 3 to 7%. This was expected, considering the improved rheological properties of the inks and the formation of a higher density crosslinked polymer network after photo-crosslinking. Qualitatively, the images of the center square openings of the mesh structures show the influence of the GelMA concentration on printability, where better defined openings were obtained at higher GelMA concentrations. The squares obtained with 3%