Figure 6.

A 3D printed stiff scaffold structure (fluorescently labelled red) with soft infilled hydrogel (fluorescently labelled green). a) Schematic illustrating layer-by-layer printing. Top lattice not shown for clarity purpose. b) The scaffold includes a lattice base off of which pillars each with a diameter of 200μm, were patterned with material #1 either at high (100%) conversion (b-d) or with a 50μm shell of low (13.5%) conversion (f-g) shown by digital photograph, grayscale digital projected image, and confocal microscopy images. Cells encapsulated in material #2 is infilled into material #1 with (e) sharp interface and (i) wide interfacial region.