A new study with Postdoctoral Researcher Steven Gauci and Principal Investigator Christopher Barner-Kowollik, published in Nature Communications, has identified a goldilocks zone of optimal photoreactivity. By precisely spacing photoreactive units in macromolecules, the research demonstrates how reaction efficiency and 3D printing quality can be significantly improved. These findings have the potential to revolutionize light-based manufacturing and advance the development of new photoresists.