Looking for some advice on a cat food dispenser

I have a simple gravity fed cat food dispenser that is great but it needs a little help. No matter what gravity feed dispenser I use it never keeps up. My cat has food out 24/7 and he regulates his food on his own.

I 3d printed a new dispenser in hopes it would solve the food falling out constantly all day, but it's not working as I expected.

So what I'm hoping to do is make a simple vibrating device that will help the food fall out constantly all day long. Maybe a raspberry pi that has a cell phone vibration fob thing that will run a routine? I don't know. I'm having a really hard time finding examples of this. Does anyone have something to reference?

Also open to ideas on non-mechanical feeders that work well, or very simple battery operated options.

Thanks!