Figure 6.

Core/Shell 3D printing by co-axial extrusion. (A) Schematic representation of the 3D co-axial handheld printer. (B) Schematic representation of the co-axial nozzle. (C) Picture of the cartridges dedicated to Core and Shell loading in the printer, with relative magnification of the nozzle during co-axial deposition. (D) Representative 3D rendered confocal images of Core/Shell printed sample labeled with fluorescent beads. The hydrogel shell is shown in red channel, while the cellular/hydrogel core is shown in green channel. The panel shows the same image representative of 3D rendered of superimposed green and red channels in three different orientations. [Modified from and used with permission from Duchi et al. (83) under CC BL].