I printed the bird feeder found here https://www.thingiverse.com/thing:1710755
and several different hooks to hang the two-liter bottle - all of which broke or came loose and I had a mess the next morning.
This is a simple hanger that pierces the two sides of the bottle.
Make a hole with a knife or drill bit on each side and hang.
2LiterHanger.stl | 50.8KB |