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Optical microscope images of the fracture surface of the 3D printed PETG-CF-based samples after Charpy test. Control samples (without sterilization process treatment): (A1–A4) PETG-H-40, PETG-L-40, PETG-H-80 and PETG -L-80; samples after the Dry Heat (DH) sterilization process: (B1–B4) PETG-H-40, PETG-L-40, PETG-H-80 and PETG-L-80; as well as samples after the Moist Heat (MH) sterilization process: (C1–C4) PETG-H-40, PETG-L-40, PETG-H-80 and PETG-L-80.
