These images show four different phenomena being the embossed particles, adhesive glass wool fibers, the dark powder and also some details from the material processing. The dark powder is mainly present in the catalyst zone, while the greyish details in the inlet and exit zone originate from refraction of light by colorless powder and crushed glass fibers. Especially in the catalyst zone, the dark powder is in the same positions as the embossed particles. All images can be found in the supporting information. The combination of the embossed particles with the dark powder lead to the question whether the found results are indicating a decomposition of polymeric material under influence of catalytic material. On the one hand, the temperature is reasonably below that required for thermal decomposition of the material; however, the catalyst particles could locally heat to higher temperatures than the measured values. On the other hand, it could be possible to catalyze the decomposition of the polymers by the active material, which is reported for fluoropolymers and Ruthenium complexes . While, our results provide no evidence for significant decomposition of the polymer, a more detailed investigation of this issue is matter of future work.