I designed a bottle opener a long time ago. I adapted it a bit for the Kitchen Design Contest.
With the opener you can open and close PET bottles as well as open "beer bottles" etc.
The opener is printed from PETG and for the beer opener you need a 2 cent coin (D19mm x 2mm)
although it is my own model I have saw that there are a lot of similar models, I linked a few of them here:
https://www.thingiverse.com/thing:5164116
https://makerworld.com/en/models/46782#profileId-48607
https://makerworld.com/en/models/16322#profileId-26549
https://www.thingiverse.com/thing:11025
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