P.B.C.O. - Plastic Bottle Cap Opener
thingiverse
This bottle opener should fit on every plastic bottle with a cap diameter of < 30mm like water bottles, Coca Cola bottles, etc. What you additionally need: Steel File 2x M3 x 20mm Screws 2x M3 Nuts An M3 x 16mm screw for fastening the attachment would be fine too, but you need to shorten it for the ideal fit anyway, so it doesn't matter. Make sure that you sharpen the other screw, with a file like it is shown in the pictures. It acts as a tooth for the bottle cap and it may not work properly otherwise. A too-long screw also harms the functionality, so if it doesn't work well for you, try to shorten the screw a little bit more.
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