Neil did a write up on etching plates a while back in ME
The other options for things like the plates found on things like motor plates is to use self printed transfers for the darker areas. This is a screen printed one but transfers would work.

And a nameplate done with transfer paper on a home printer, thats 15mm dia

For simple raised letters you can get individuals from some of the model railroad suppliers, I did these with "Slaters" letters

Edited By JasonB on 12/11/2015 07:32:22