FIG. 1.

Schematic of the fabrication process for 3D hydrogel scaffolds. (A) Printing of sacrificial alginate/pluronic mold. (B) Dispensing of collagen/GelMA solution into the mold structure. (C) Interfacial reaction between the sacrificial hydrogel and collagen/GelMA solution. (D) Curing of hydrogel either via UV crosslinking for GelMA or thermal incubation for collagen. (E) Removal of support by soaking the printed structure in cold PBS solution. GelMA, gelatin methacrylate; PBS, phosphate-buffered saline. Color images are available online.