We performed investigations to find a suitable concentration range for each component, as inks with no yield stress would result in poor print quality and inks with a high yield stress might clog the extrusion nozzle. Table indicates the yield stress of the presented inks. The PEDOT:PSS content has the greatest impact on the yield stress as well as the viscosity of the ink before flow is initiated. In contrast, the BIS content has no impact on the flow initiation behavior. The MC content seems to also have limited impact on flow initiation before a concentration threshold is reached. Four of the inks with different MC content behave quite similarly, with only the ink with the highest MC concentration demonstrating a higher yield stress. . Flow Initiation Behavior. The yield stress indicates the stress where flow is initiated and is the intersection of the fitted lines before and after flow begins. The viscosity at which the yield stress occurs is also reported. This data is derived from the plots in the top row of Figure .