The driving key factor in engineering and thus in chemical engineering lies in the adaption of conventional knowledge to unconventional environments. Ideas can cook and ripe in this melting pot of ideas. A great unconventional area is applications beyond earth where technical ideas can emerge. We would be delighted if you could look at the article from this perspective and then confirm that polymer reactors are an answer that has so far gone unnoticed to the question: What construction material can be used in catalysis when metals are not suitable? Polytetrafluoroethylene (PTFE) and related compounds are thermoplastics and therefore in general suitable for processing via additive manufacturing for applications in space . Additive manufacturing is supported by institutions like ASTM international, is already prevalent in aerospace industry, and it has, while in its infancy, a massive potential in space applications . Here, several aspects of material science and material engineering have to be considered, being structure, properties, processing and performance, which need to be adapted and tuned for space missions .