Summary Ryan's Bird feeder was designed to accept one plastic SOLO cup full of bird seed. Printed out of ABS it is strong a also a pain to manufacture. The post slides through the base and is locked in by a key on the underside. The post serves as a place to attach your hanger wire as well as locking the cup into the base. several notches in the underside allow you to find the center of gravity for your feeder. Simple and effective . This project is the product of a lesson for my son that you can create whatever you can imagine. drill a couple of holes in the base for drainage Added the correct key that keeps everything nice and tight. Damn Squirrels were knocking the cup off. This is ready for production