Figure 1.

Resin composition and 3D printing. (a) Molecular structure of monomer (HEA), cross-linker (HDDA), 4-arm thiol (PETMP), and photoinitiator (BAPO). Compositions shown are for the DLP-printed resin, which also includes 0.497 wt % water-based green food dye. (b) Chain-network graphic illustrating pristine and self-healed bonding states. All damage repair is enabled using rapid hydrogen bonding. (c) 14.7-cm-tall gyroid lattice with continuously varying infill density (60% to 5% from top to bottom) printed on a commercial 3D Systems Figure 4 DLP 3D printer. The 130-g print was completed in 6 h and 21 min, with no visible defects.