Fig. 5: Multi-material universal printing of different slurries by NIR-DIW.

a Photographs of grid structure, b discrete gradient structure, c spring green body, and d sintered spring printed with 0.60 mm nozzle. For colored ceramic slurry, the composition contained 2.00 wt% (weight of alumina) of iron red, chromium green or 3% yttrium stabilized zirconia. The scale bar corresponds to 5 mm.