Notably, both inks exhibited excep onal prin ng quali es (Figure ). A 2.5D "circularity" symbol (bounding box 50x50 µm, z-height: 5 µm) as well as a submarine (bounding box 60x50 µm, z-height: 10 µm) were first printed to demonstrate also that large, flat structures with very smooth surfaces can be printed. Then, the level of complexity of the structures was gradually increased by prin ng geometries that exhibited different degrees of overhanging features. The benchmark structure "Benchy" (small boat, bounding box 20x10 µm, z-height: 15 µm), was also successfully fabricated. This structure is specifically designed to provide a wide range of challenging geometrical features, such as the 90° overhang on the roof. Furthermore, a hollow fullerene buckyball structure (bounding box 15x15 µm, z-height: 15 µm) was successfully printed as well. In both cases it was possible to create free-standing structures with well-defined pentagons and hexagons. In the top-down view (Figure ) it is clearly visible, that the buckyballs are highly symmetrical and perfectly hollow. Finally, a porous, gyroid-like structure was printed (bounding box 30x30 µm, z-height: 17.5 µm). The pores of the structures are con nuously open and well defined in both cases, as can be appreciated in the topdown view (Figure ). It should be noted that the op mal prin ng parameters were dependent on both the microalgae used and the geometry of choice. By using the op mized prin ng parameters, complex geometries with high quality were achieved for both inks.