I've been using a standard plastic feeder but lately my girls have been slinging feed everywhere trying to get to the sunflower seeds (they get a whole grain feed). So I decided to make a make a PVC feeder. After much Pinterest consultation and a few trial and error modifications this is what I came up with. It seems to be working great! They can't sling their feed anymore! The cost was about $30; totally worth its weight in wasted feed.