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Optical microscope images of the fracture surface of the 3D printed CPE-based samples after the Charpy test. Control samples (without sterilization process treatment): (A1) CPE-H-40, (A2) CPE-L-40 and (A3) CPE-H-80, (A4) CPE-L-80; samples after the Dry Heat (DH) sterilization process: (B1) CPE-H-40, (B2) CPE-L-40, (B3) CPE-H-80 and (B4) CPE-L-80; as well as samples after the Moist Heat (MH) sterilization process: (C1) CPE-H-40, (C2) CPE-L-40, (C3) CPE-H-80 and (C4) CPE-L-80.
