I'll look into it for sure
Just keep in mind, if it's gun metal or darker, it will be rather difficult to read since it's all one tone. When 3D printing metal, you can't do different tones so it's all going to be the same look and feel.
Only way you can do two tones is if the plaque is two pieces that fit together but I think that would be a lot more complicated and expensive.
Anyway, I'm seeking out different 3D printers as I work on this to see what material/finish would be best.