Inspired by http://www.printednest.com/
I cant get their model to print, so I decided to design my own birdfeeder. It is see-through, so you can hang it on your window and see the birds land.
The model has 3 holes for using nails in a wall and a hook, which should be used with a custom hook later (this needs to be designed).

V1 turned out to be too flimsy, V2 has been made stronger.
V3 has a small change on the holes.

Check the gallery for the incorporated holes for hanging on a wall. Additionally a handle is added at the top, which will serve to connect a hook to hang for example on a fence.

I also added the OpenSCAD source code, so you can tinker with it yourself.