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Fiber diameter measurements (a) and apparent viscosity (b) of PPF-HA solutions (containing 1.25, 2.5, 5 and 10 wt% HA) printed at varied temperature, pressure (0.4 bar for 1.25 wt%, 0.5 bar for 2.5, 5, and 10 wt%), and speed to print fibers with similar diameters. Printing solutions extruded with a 0.840 mm (inner diameter) syringe tip. Measurements reported as mean ± standard deviation (n = 3).
