I built this feeder based off of the information I found on this website. By the way I LOVE this site. It is built from 4 inch PVC, and is angled at 60 degrees. I use layer pellets for my girls, but I find I have to shake the feeder for the food to pass the elbow. I live in Utah and we get a good amount of snow, so I built a little house for the feeder to keep the food out. Any suggestions?