In this research, we used commercially available microalgal oil to formulate a highly bio-based 3D printing resin. Following a similar protocol as soybean oil, the double bonds on the raw microalgal oil's fatty acids were first epoxidized. In a subsequent step, methacrylate groups were introduced at the locations of the epoxide rings. The products of every reaction were monitored using 1H NMR spectroscopy. The resulting methacrylated microalgal oil was used as the main component in a photo-curable resin. Aiming to increase the bio-based material content of the resin, different resin formulations were produced, and the final materials were tested for their mechanical properties (Scheme 1).