As gelatin chains assemble into triple helices near the gelling point, GelMA demonstrates a distinct yield point at which the ink transitions from elastic to flow behavior (black stars in Figure ). Likewise, GelMA/TbPE inks exhibited characteristic yield stress points that continuously rose with TbPE loading (𝐶 !"#$ ≥ 7.5 wt%, red squares in Figure ), owing to the increasing number of PEC domains. In contrast, the GelMA/DbPE inks did not exhibit either a plateau or a steep viscosity-drop region, but rather a continuous and slow decline in viscosity (blue circles in Figure ). The absence of a specific stress required for flow initiation of the GelMA/DbPE inks was ascribed to the lack of both physical gelation of GelMA at 37 °C and the lack of interconnection among the PEC micelles. Nevertheless, comparable viscosities of the 22 °C GelMA inks and 37 °C GelMA/DbPE inks in the low and high stress regimes (corresponding to the pre-and post-yield states of 22 °C GelMA inks) engendered confidence towards printability of GelMA/DbPE inks.