I have printed the raised text buttons and painted them. I found it hard to create a smooth surface on the black paint, and to get it uniform enough to have no light bleed. I'm now experimenting with doing a filament change for the recessed text buttons just as the letter starts to print. So basically I have a transparent filament base and then switch to black. It might work better with slightly more shallow recess because looking at the recessed letters at an angle distorts them a bit. I'll see if this is viable, changing to a 0.2 nozzle as we speak. The pictures below is the first test print with a 0.4 nozzle.