Bird feeder on PET bottle

thingiverse

The T38 feeder is based on experience from the practical use of a larger round version, where more than two birds rarely meet on the feeder. This is especially true for titmouse. This type reduces the problem of feed ejection presented by some species. There is also a smaller amount of feed exposed to the weather. The feeder is more economical to print and more compact. During the tests, the frequency of bird visits fully matched the larger type, with losses by dropping feed on the ground being significantly lower.