Due to the fast solidification rate of the melts, as previously shown by Nahm et al. for poly(2ethyl-2-oxazine) (PEtOzi), a small distance of 4 mm between the print head and the collector is required to enable sufficient direct writing. Furthermore, fiber pulsing after 5 to 10 layers was observed and therefore, manual adjustment of the applied voltage while printing was needed to enable accurate fiber placement with homogenous diameters and reduce fiber pulsing or jet break within higher layers.