Window bird feeder

Bird feeder to mount on a window using double sided tape. I only mounted the bottle holder to be able to remove it easily. Do not fill up the bottle too much to lower the overall weight.

I made two versions, as it seems there are two different types of threads used for PET bottles (I'm not an expert for bottle threads... ¯\\_(ツ)_/¯ ).
- Older type: PCO1810 (also PCO28) / ~3 mm pitch
- Newer type: PCO1881 / ~2.7 mm pitch

The bottle holder is specific for the bottle i use (5 dl / 61.5 mm outside, 54 mm inside diameter), so you may want to design your own one.