The viscosity was highly influenced by the addition of either the plasticizer or the drug, the combination of both resulted just in a minor drop compared to the IND containing sample. In these samples IND has a bigger influence on the melt viscosity than the additionally used plasticizer. However, the added plasticizer influences the printability of the polymer-drug blends, which will be discussed below. In particular, it needs to be considered, that the amount of triethyl citrate added to the blend was only 5 wt%, whereas 50 wt% of the drug was added.