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Change in the Charpy impact strength (A) and Shore D hardness (B) of the FDM dumbbells due to the DH or MH sterilization process as measured in the (a) PLA, (b) PETG-CF and (c) CPE-L. Grey bar: control sample; blue bar: dry heat sterilization; and red bar: moist heat sterilization. a–c Different letters show statistically significant differences between formulations (p < 0.05).
