Bottle Cap Holder

thingiverse

This adapter ring fits standard beer bottles that are 330 ml or 500 ml in size. You can use caps from other bottles, just like I did. The ring has two holes on both sides of it. To use the adapter correctly, you need to place the short flattened side at the top of the bottle, as shown in the photos. Once it's in position, the bottle cap will be fully seated and opens with a satisfying "pop" sound. It's also relatively easy to print.