First try with TPU. Looks like it's absorbed moisture. Can someone

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Is this normal for TPU? First time printing tpu. : r/3Dprinting

An explorative study on the antimicrobial effects and mechanical properties of 3D printed PLA and TPU surfaces loaded with Ag and Cu against nosocomial and foodborne pathogens - ScienceDirect

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UV-Vis spectra of TPU and M-TPU films as function of exposure time, (a)