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I created this bird using an PET bottle and 3D printing. Its been in use for a year now and I can definitely recommend it.
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All the parts should be printed with PTEG, because it of outdoor usage. I also recommend using white filament.
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You will have to use an M5 nut and screw with this model. This also make it possible to adjust the amount of seeds being losend. This is also very handy for refilling, because it possible to close the feeder before installing it.
The author hasn't provided the model origin yet.