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Printed and molded hydrogels exhibit different microstructures as well as swelling behavior. Optical micrographs for molded (a) and printed (b) GelMA samples (15% GelMA, 0.25% LAP). Scale bars: 500 μm. (c) Polymer density of extruded and molded cylinders. No statistical difference between the two groups. (d) Swelling percentage data (*p < 0.05, **p < 0.01) obtained from weighing printed and molded GelMA cylinders (15% GelMA, 0.25% LAP) over time in immersion in PBS.
