I replaced my old standard bird feeder in the form of a house with this one. Since then we have huge numbers of small bird feeding. 

It took some iterations to get here. Base was the model Deep Cup Bird Feeder from The_Purple_One. I added the skrew for an Evian water bottle from The Polymersmith (thanks).

However, it didn't take long for magpies and crows to arrive too. And as clever as they are they just shake the bottle to make the grains fall down. So I had to protect the feeder from above by some spikes (thanks David D ) and the big sombrero from below. This protects the feeder also from getting wet. 

After several tries with other materials I'm using ASA. PLA, PETG and ABS all didn't last long outside in the sun and the cold.

ASA, no supports, 0.2mm