UPDATE:  Added a deck railing mount so you can easily pick up and clean out the bird feeder.

I printed @Sammm2907_362232 Bird bath but didn't want the water to fill all the way to the top.  So, I re-modeled it as close to the original but I made it in two parts for easier printing.

Once the holes get blocked by water, the water stops flowing.  Once water goes below those holes, it starts filling up again.

Recommended to use PETG for outdoor.

If you want to download or remix my models, you can go here - https://cad.onshape.com/documents/0c6c20b2a3893e676acf46b2/w/0d787a8672939329f800bcdb/e/36085e067e3f6d9d1f0bb159?renderMode=0&uiState=64a98d962227c45aa4b17341

OnShape is free to use or you could just download a STEP file if you want.