I wasn't completely happy with the keypad keys that I had modeled and printed. Since my printer is only single color I had to extrude the key symbols up from the tops of the key caps and pause the print to switch filaments to change the color of the labels.

My local makerspace (Kwartzlab) now has three Bambu Lab P1S printers with AMS units, and I have been wanting to try out multi-color printing. So I tweaked the key cap models a bit so that the labels were separate "bodies" (objects) inserted into the keys. This allows you to assign different colors to the key and the label in Bambu Studio. At the same time I adjusted the label sketches so that the strokes were at least .8 mm wide. This ensured that they were "drawn" with at least two "lines" of filament. 

The result was very satisfying.

On the left my original key caps printed on my Prusa MK3S+. In the middle caps with my new and improved labels. Of necessity, labels are still a bit larger than the original Trekulators so they can be printed with a .4 mm nozzle, but they are much better defined now and they don't have a rough feel since the labels are flush with the key tops now.

Definitely worth the effort.