(a) Optical, SEM, live (green)/dead (red), and DAPI (blue)/phalloidin (green) images, along with the measured FWHM, for various pneumatic pressures (100, 200, and 300 kPa). (b) Initial cell viability calculated using the live/dead images at 1 d for the scaffolds (8 × 8 × 0.5 mm3) printed using the various pneumatic pressures (n = 9, *P < 0.05). (c) Circularity of the DAPI and (d) orientation factor of the F-actin calculated using the DAPI/phalloidin images of the structures (n = 9, *P < 0.05).