I had a similar feeder in the past where thread broke. I decided to design my own. As it was the best not to limit myself to dedicated bird food container I decided to use regular plastic bottles and go with modular design to be able to switch adapters to one base.

Advantage of this design compared to round ones available out there is that here you have very small risk of clog - the hole that allows the grains and other stuff to go out is big and risk of clog is almost zero (especially with 38mm bottle).

Holes at the bottom keep the food dry and vented.

Currently supported:

• 28mm bottle thread - most popular plastic bottles in Poland and rest of the EU
• 38,5mm bottle thread - this one is for Coca Cola's Cappy orange juice bottle

Do you need any other thread? Let me know and I'll cook one for you :)

I haven't printed any hooks for the bottle - maybe in 2nd version.