Anyone know which automatic cat feeder can handle big kibble without jamming?

I ran into the same problem with big kibble constantly jamming my feeder. I first tried breaking up the food and keeping the hopper fuller but that was a pain and only helped a little. What finally worked was adding a small plastic wedge inside the hopper to steepen the slope and sticking a tiny tape tab on the rotating paddle so it sweeps the outlet, then switching the schedule to more frequent smaller drops and giving the hopper a quick shake after refilling; since then it has run fine with the chunky pieces.

Been there. The feeders that struggle most with chunky kibble tend to use a flat paddle or a narrow gate because pieces bridge and the motor spins. What helps is picking a design that moves food with a single screw style auger or a straight gravity drop with a wide throat and the bigger the exit tunnel the better. If the maker lists a max kibble diameter, aim for twelve to fourteen millimeters, and avoid wafers and flat discs since those love to lock together. Round or irregular nuggets slide better than coins.

Setup matters as much as the mechanism. Keep the unit level, leave headspace in the hopper, and keep fines out by pouring through your hand or a strainer so the dust does not cake the walls. Dry the bin thoroughly after washing to reduce tacky spots, and throw a fresh desiccant pack nearby so humidity does not swell the food. A taller bowl or a little gap under the chute helps too so kibble does not back up against the outlet. I get fewer hiccups with two or three medium feedings that push a real sweep through the throat rather than lots of tiny drops.

Grew up in a damp place and big kibble was a jam magnet in every feeder I tried and... what finally made the difference was treating it like a flow problem instead of a power problem. I raised the feeder a bit so the food falls cleanly into the bowl, stopped topping the hopper to the brim, and shook out the dust from the bag before filling. Then I mixed in a small handful of smaller kibble as ball bearings and it kept the chunky pieces moving. Works great.

If you do not want to mix foods, you can get similar results by running a larger test dispense after refills to clear the throat, then switching back to your normal schedule. Also worth checking the path for anything that creates a pinch point like a warped lid or a misaligned baffle. Tiny things, but with big pieces they add up fast.