As it is to be expected, the polymers showed temperature dependent viscosity (Figure ), In the literature, the viscosity of polymer melts is described to be shear thinning with changes in viscosity over two orders of magnitude within the shear rate range measured here. However, such behavior cannot be observed for the POx/POzi based polymers. On the other hand, the decrease in viscosity with increasing temperature is in line with the results of other polymers studied previously. Preliminary printing tests via MEW showed, that MEW printing of all four synthesized polymers was not easily achieved. High temperatures (at least 170 °C) were necessary to liquify the polymers sufficiently, similar to our first work on MEW with poly(2-ethyl-2-oxazoline). Additionally, they needed to be kept at such elevated temperature over several hours to successfully remove all air bubbles within the polymer melt. Heating the polymer over long time resulted in discoloration and therefore probably partial degradation of the polymers, despite working under N2 atmosphere. Therefore, it was decided to investigate the influence of different plasticizers on the thermal and viscoelastic properties of the polymers and investigate the influence of the plasticizers on the printability of the polymers. In the following, citrate-based, acetyl-based and glycol-based plasticizers are investigated and their influence on the polymer's thermal properties and viscosity is discussed. To the best of our knowledge, the effect of plasticizers on poly(2-oxazoline)s and poly(2-oxazine)s in general and ABA triblock copolymer in particular has not been studied to date.