It's been aaaages since I did anything 3DP-related so this little corner of my world has been neglected.
Thank you to all who have made a version and posted pics.
It's really cool to see them all and thanks for making the effort to share :-)
I'm still using my feeder and would make the following changes if I did it again now....
1) print a "holding" piece like Martijndewinter (below) did. LOVE you improvements!! :-)
Then simply pierce two holes in the bottle and hook it in. MUCH simpler. (In fact I ended up doing just that with an old wire coathanger)
2) Make a "hat" for the bottle to keep the water from wetting (and then clogging) the seed.
Thanks again, enjoy your printing adventures!