Bird Water feeder (reinforced)

A remix of Hajo's most excellent bird water feeder. 

Like Hajo's original post, all the other bird drink machines that I found drained in seconds, but this one actually works!

Unfortunately, I over tightened the PET bottle and sheared the threaded collar. It seems that the thinnest part of the wall was where the threaded hexagonal collar ends and the small reservoir starts. 

Edited with meshmixer to extend the thicker hexagonal collar to just above the top water hole.

Thanks again Hajo. The chickens love your design.