I designed this bird feeder to use a wine bottle to hold the seed. I have seen a few similar designs but none suited my needs exactly.
You will need a piece of rope roughly 3mm in diameter:
Edit: I have had a few incidents with strong wind where the top part has lifted off the bottle, resulting in the whole feeder flipping upside down. As such I have added a new top part that is 5mm longer.
Update, Ive added a funnel to help fill the bottle.
Bird_Feeder_Funnel_Mk2.stl | 471.4KB | |
Feeder_Lower_mk1.stl | 2.0MB | |
Feeder_Top_mk1.stl | 525.4KB | |
Feeder_Top_mk2_-_Tall.stl | 523.0KB |