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Microstructures of extruded (a) CNF, (b) TOCNF, and (c) AceCNF filaments. (d) 3D-printed CNF scaffold showing the swelled filament merging upon extrusion. The scaffolds corresponding to (e) 3D-printed TOCNF and (f) AceCNF are also shown. The scale bars for (a–c) and (d–f) are 100 and 200 μm, respectively.
