Bird Feeder Bottle Cap

thingiverse

I stumbled upon a picture of a design similar to this one just a few days ago on Thingiverse (https://www.thingiverse.com/thing:2883603). I was really impressed by it, but I needed to modify it to fit a bottle that's readily available in Germany. When adapting the design, keep in mind that your bottle should have an outer thread diameter of 37 mm. I've also included just the thread part so you can test if it fits snugly onto your bottle. Have fun with it!