This paper reports a 3D photo-printable dynamic covalent network that allows for independent reprogramming of geometry and mechanical properties after printing. The network contains hindered urea bonds and pendant hydroxyl groups, enabling two controllable bond exchange reactions. Homolytic exchange reconfigures shape without affecting mechanical properties, while transformation of hindered urea bonds into urethane bonds tailors mechanical properties. This on-demand reprogrammability allows multiple products from a single printing step.
