Thanks for the prompt reply! I'm probably misreading things.

Here is one source of information: https://projects.ttlexceeded.com/3dp...zle_sizes.html
I saw the table of nozzle sizes, and interpreted min layer height. I have no idea what the x-y resolution would be. The author mentions using a Prusa machine.

But 20-50 micron resolution (if I read it correctly) sounds like a much nicer result.
But I also read that FDM can be sanded and polished afterwards. With the amount of work I'm committing to, a bit of sanding doesn't sound bad.

A translucent material for filling the debossed region might give me a nice effect with led backlight.

I don't have a printer now, so am doing a lot of window shopping. I need to know what is possible before committing to a technology.
I still haven't settled on FDM vs SLA vs SLS.