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Printability assessment of HA/gelatin composites with different amounts of HA. Microscopic images (scale bar = 500 μm) and photographs (scale bar = 5 mm) of 3D-printed HA/gelatin composite scaffolds with (a,e) 0%, (b,f) 60%, (c,g) 70%, and (d,h) 80% HA. Statistical analysis of (i) strut diameters and (j) pore sizes. Photographs of 60% HA/gelatin composite scaffold under optimal printing conditions: (k) top and (l) side view (scale bar = 5 mm).
