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EHD bioprinting of lattice hydrogel with the core-sheath filaments. (A-C) The macroscopical and microscopical morphology of the lattice structures. (D and E) The core-sheath hydrogel filaments with green microbeads in the core line and red microbeads in the sheath line. The bright-field image (F) and fluorescent image (G) of the hollow hydrogel filament. (H) The cross-section of the 3D reconstructed models of hollow hydrogel filament. (I-K) Dye perfusion through the hollow filaments.
