The goal of the PHOTO-AUP project is to develop biodegradable photo-crosslinkable polymer precursors for resins to be deployed in various, application-dependent and light-based 3D printing techniques DLP (digital light projection), SLA (stereolithography), VAM (volumetric additive manufacturing) and 2-PP (two-photon polymerization) and for use as coatings on manure pellets to enable gradual and more effective nutrient release.