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Optimization of the chitosan-gelatin blend printing parameters. (A) Extrusion of the blend at different pressures. (B) Printed fiber diameter at different speed values. (C) Effect of the combination between the selected pressure (P = 2.5 bar) and different speed values; (D) on the top panel schematic representation of the 3D designed scaffold and on the lower panel frontal and lateral view of the obtained 3D printed scaffold (i.e., 1CHI2GEL, 2% w/v chitosan, 4% w/v gelatin).
