Its that time of the year, lots of birds around my home & work so I created this bird feeder that utilizes the PRUSAMENT spool half as a perch for the birds. The threads are PCO1881 specification, so it should fit most soda bottle types. The threads on these models have built-in tolerances for most 3D printers.
Link: https://www.prusaprinters.org/prints/35756-prusament-soda-bottle-bird-feeder