What elbows do you have? are they 90 degree? and is the food a pellet or a mix with various things? some birds will toss out the bits they don't like as well from a mix...
I made my feeder with a 5 gal. bucket, with 3 feeding ports, I used 3" 90 degree elbows, and I feed them (blue seal crumbles), I have no waste
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