My automatic dog feeders work great but only hold enough food for a few days so I designed and printed a funneling system and a resovoir to hold the entire bag so all I have to do is fill the resovoir when I get a new bag. Works great.
Edit: don't know why the photo uploaded sideways. Sorry about that.
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They're on a timer and I can set how much food is dispensed. I feed them twice a day different amounts for each dog and they know (most of the time) which bowl is theirs and don't touch the other one.
EDIT: I realized you might be talking about the puzzle bowls specifically. The food fills the crevices and it's harder to get the food out so it slows them down some.