Universal TPU-PETG Respirator
thingiverse
Universal Respirator with TPU Sealing for Mouthpiece. You can scale it up or down to achieve a perfect fit. Alternatively, try the method using a hot gun. Reference Link: https://drive.google.com/open?id=1VbKYciUwVO9MJCcfAO5n-A_mieHKIHaO
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