The cap for my 2oz bottle of bitters broke, so I made a replacement cap.
I printed in "0.20mm QUALITY" with Prusament PLA, but any tuned profile/filament should work well.
Using a food-safe filament wouldn't hurt, but I'm not overly worried, as far as I can tell, only the rubber gasket of the dropper portion actually comes into contact with the liquid.
The author hasn't provided the model origin yet.