SEM images of 3D microstructures printed using O. aurita-based and T. striata-based inks demonstrating the efficiency of the microalgae-based systems. In the case of O. aurita-based inks, a laser power of 25 mW and a scan speed of 12 000 µm s−1 were chosen for filigree structures such as the Benchy, the buckyball and the gyroid geometry. For bulky structures, such as the submarine and the circularity symbol, the scan speed was increased to 14 000 – 16 000 µm s−1. For T. striata-based inks, laser powers between 15 and 20 mW at a scanning speed of 18 000 µm s−1 performed best for bulky structures, whereas filigree structures were preferably printed using 20 mW and 12 000 – 14 000 µm s−1. Scale bar = 10 µm.
