Bird feeder bottle
thingiverse
PET Bottle Bird Feeder Designed for bottles with an 80mm diameter, this feeder requires no modification other than cutting a hole at the top and attaching the mouthpiece with glue. Next, screw on the nose piece and secure it in place using glue. Two versions of the feeder are shown - one larger, one smaller. Edit: December 4th, 2018 A revised version 2 has been added to address the issue of seeds spilling out. This updated design features an improved 'roof' inside the bottle that helps keep the seed in place.
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