Waele to obtain the flow-index n and consistency index K to characterize the hydrogel. ). Notably, the gel structure of the system recovers very rapidly (Figure ), which is highly favorable for processing like 3D printing. To obtain first insights into the morphology and microstructure of the novel hydrogels, we obtained scanning electron microscopy (SEM) images after freeze-drying. At 20 wt.%, the hydrogel of A-PPheOzi 15 -A exhibited a highly porous and rather homogenously distributed microstructure with pores in the 5 to 10 µm range (Figure ). However, as currently strongly discussed in the community, due to slow water evaporation during lyophilizaton or ice crystal formation during slow freezing, these features could in fact be artefacts of sample preparation.