Figure 1.

Schematic diagrams of the 3D extrusion of a bilayered feedrod for the production of bioinspired CaP scaffolds with a continuously gradient macro/microporous structure: (A) the bioinspired CaP scaffold with a continuously gradient macro/microporous structure; (B) the extrusion of a bilayered feedrod, comprised of a CaP/camphene body with a CaP content of 15 vol % and a pure camphene as the lower and upper parts, respectively, for the creation of green filaments with a continuously gradient core/shell structure; (C) 3D deposition of the extruded filaments for producing a triangular prism with a unique gradient macrostructure; and (D) assembly process and subsequent heat-treatment to produce bioinspired porous CaP scaffolds with a continuously gradient macro/microporous structure.