Originally Posted by
coherent
Not sure what you are asking. You say the letters are .5" high... do you mean .5" deep, or are the letter raised (or proud) of the material surface?
If you mean letter depth, then the only option I see is using the micro bit like you already are. .5 inch is extremely deep for such narrow lettering. You don't say why but I can think of no reason unless it's a mold or something? It simply may not be possible with a router or engraver and a laser or other process may be the only option.