Turn a water bottle into a bird-feeder.

Outer ring is almost 16cm in diameter, so position it carefully!

Print bottom and top. Hot-glue the two together.

Screw a water bottle full of birdseed into it and hang with a bit of wire.

NOTE: This thing is for 30mm bottle tops. If your bottle has 120 degree spaced thread starts.. print the _120 bottom STL. If it has an even number of thread starts, print the other bottom.

(I may add a printed hanger in the future)