Probably the only way to make it reliably foodsafe without a lot of postprocessing would be replacing the parts frequently. It's possible to perfectly merge the layers by printing with 100% infill, burying the part in fine grained salt and then remelting it in an oven, but that takes time.

No, the stuff that directly comes out of the 3D printer is not foodsafe. Some of it is biocompatible, though, which means you can safely lick it for a while. But you can use 3D printing to create foodsafe molds and then use them to cast foodsafe plastic copies of your 3D-printed master.

It also depends on what you are doing. If they are single-use, they can be made food-safe pretty easily, even with the nooks and crannies. With 3d printing, it can be pretty cheap to do single-use stuff. You can also electro-plate them with silver and have a pretty sanitary part.

I wouldn't call it a recommendation, but I suffer through using my Formlabs SLA printer because the results are of amazing quality. But their resin is expensive, you need 2 additional machines if you want to do the washing and curing halfway conveniently and since the beginning (and still ongoing) there have been firmware issues which cause the machine to sometimes lock you out of a DRM-ed resin cartridge before it is actually empty ... but in exchange you get a pretty reliable 0.1mm precision on stable waterproof parts that look like they were injection molded. With the right settings, nobody will recognize the parts as 3D printed because there are no visible layer lines at all and after a bit of varnish you can get the clear resin to be see-through like acrylic glass.