The time the polymer remains above the melting temperature in this filament-based setup is shorter compared to the more common MEW setup with a syringe reservoir, which usually contains between 1 and 3 mL of molten material. Exposure to high temperatures can degrade the polymer's molecular structure, consequently affecting its physical-chemical properties . To analyze the thermal stability of nylon-12 in the current filament-based setup, the untreated filament was heated to 230°C for 3 h (Figure ). The material undergoes minimal and prolonged degradation, resulting in a total weight loss of 1.5%. A longterm effect of polymer heating can be observed in the nozzle, where the deposited nylon-12 undergoes prolonged degradation over several days, resulting in a black coating. As seen in the picture embedded in Figure , the non-degraded nylon-12 is being extruded alongside the degraded coating.