Fig. 6: Rapid 3D printing of macroscale metamaterial-like structures.

a 3D CAD profile of material unit cell. b 15 × 15 × 15 unit metamaterial-like structure fabricated with 400 µm s⁻¹ vertical stage speed for each unit. c Magnified view of side of structure in b with view angle about 57° from substrate normal. d Optical image of 42 × 42 × 42 unit metamaterial-like structure situated near the edge of a United States one-cent coin. Each unit cell was fabricated with 1 mm s⁻¹ vertical stage speed. Including all stage motions at the same 1 mm s⁻¹ speed, total print time was about 2.3 hours. e SEM image of structure from d. f Magnified view of side of structure in e with view angle about 65˚ from substrate normal. Holes in structures are missing unit cells where DMD failed to trigger and display patterns during printing