We are dangling some electronics from a hummingbird feeder. This coupler is screwed into the top of a watertight container that has a PIT reader and batteries. There is a bracket to hold an antenna that is attached with a wire tie.
I printed this on a MakerBot TOM in ABS.
This is a first revision. A later revision will have an instrumented perch to weigh the bird.
This is the final version of the Mark I feeder.