I have 2 Prusa printers and I'm always upgrading. MK2, MK2.5, MK3, MK3S, MMU2, ...
Every time I take apart and put back together a printer I've been using little trays to hold all the parts. When I go to grab a bolt, I find myself checking a guide to make sure I grabbed the correct size.
So I decided I would add the guide to the tray ;-)
I used PETG--because I like printing with it--but you can use anything. If you want to have the legends in a different color and you're printing with 0.2mm height, then you can add a color correction at 0.8mm and 1.4mm.