Retro style name tag with 14 segments per character. You simply color it in with a Sharpie, or edit the CAD file below and remove segments.

You can use the color paint tool in fill mode for a permanently-colored tag with only 1 filament change. Just add a pause at the correct layer in preview mode.

Here's the alphabet with upper and lower cases:

Of course, you can create most other ASCII characters if you're creative ;)