My home-made feeder has three compartments, one for oyster shell, one for layer feed and one for grit. The problem is the oyster shell doesn't come out of it very good. So today I saw these ice cube trays that I picked up out of the free box at a garage sale over the summer and well this is what I came up with.... I just ran a couple of screws right through the tray and filled it up. We'll see if the girls like it. DH said it looks very hill-billy-ish! I told him the price was right!