Bottle Cap Marker

thingiverse

So here's a Bottle Cap Marker that fits any 30mm diameter bottlecap. I got fed up in the office with people writing their names on bottles and then forgetting they had an open one, only to start another one and end up throwing away about 10 bottles a week because nobody was drinking from them and opening a new one. So I came up with this design that lets you stick a name on with a label maker. It snaps onto the cap in a satisfyingly snug fit, can be taken off to open the bottle, and stored away if you don't have a bottle handy.