There is still work to be done. Each button has engraved lettering appropriate for its function, but the letters are a bit difficult to see. I have ordered a Prusa MK2S (Mike got one during our work and so far, it's pretty nice) and will try printing refined parts once I have it up and running. The Prusa can print up to 50 micros, but I am not certain if that will help in this case. If it does, all writing will be engraved and white painted added via a zero brush or toothpick tip.
I would also like to take a crack at Printing actual knobs that replicate the ones on the real GPS unit. But this is a secondary desire to having proper markings on the unit. For now, I am focusing on creating assets for other elements of the cockpit. Next up will be the Audio Panel and the Throttle Assembly! Thanks for ready and feel free to ask any questions about this process!