Bird feeder for 38mm and 28mm bottles
thingiverse
Bird feeder designed for both 38mm and 28mm neck bottles. By default larger bottles are compatible but with reducing insert it also works with smaller necks. Holes around the bottom of the feeder allow to insertion of different kinds of branches and sticks for birds to sit on. Drainage is provided to stop water from accumulating in the pockets. To make it easier to refill bottles with seeds connector can be used to make a funnel from another 28mm-neck bottle.
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