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3D bio-printing using bio-ink. (A): Needles with varying diameters; (B): 3D printing model of bio-scaffold; (C): Images of the 3D printer; (D1–D6): Appearance of bio-scaffolds with different filling distances at (D1) 1.8 mm, (D2) 1.6 mm, (D3) 1.2 mm, (D4) 1.0 mm, (D5) 0.8 mm, and (D6) 0.6 mm; Appearance of (E1) Cs/Gel/HA composite scaffold, (E2) Cs/Gel/HA/0.024%GR composite scaffold, (E3) Cs/Gel/HA/0.06%GR composite scaffold, and (E4) Cs/Gel/HA/0.1%GR composite scaffold.
