Sample print obtained from resin with a) conventional, non-functional crosslinker and b) HABI crosslinker. c) Magnified image obtained using optical microscopy.

a) A 3D printed “Statue of Liberty” created using photoresin containing HABI. Initially, the object had a blue hue owing to the remaining cyanine dye. However, the color then changed to yellow during the post-curing process. When the torch region of the statue was selectively exposed to 405 nm light, the irradiated area changed to a greenish-blue color, confirming the generation of lophyl radicals. The torch returned to its original yellow color after a few minutes without light exposure. b) Optical microscopic images demonstrating the crack-healing capability of HABI-containing films with a conventional crosslinker (left) and HABI crosslinker (right). c) Schematic representation of the selective erasing process upon light exposure (top) and optical microscopic images of 3D printed objects featuring the engraved letters “KRICT” on the surface (bottom). Excessive amount of 2-ethylhexanethiol was added as a hydrogen donor. Upon selective irradiation with 405 nm light, the engraved letters on the product underwent sequential removal.