No I used a Cura post processing script to do a filament change at 3mm.
Then switched to white and printed the characters. It was exciting when it worked!
It’s better than painting which can be inconsistent and doesn’t cover the text sides.
The filament change is fiddly, but with prototypes you get used to it.
When I do the ECAM panel I’ll try the public laser which the local library is getting this month, we can use it @£15/hour with help at hand.