Here, the modeling clay shows up a bit too much in the perimeters around the text. I downloaded the side mounts off thingiverse, but the cross-bar I made myself in Fusion 360 to match the screwdrivers I had. The Bear logo is printed in yellow PLA, but the text is filled in with yellow modeling clay. I'm posing a couple of pictures here of the result. You rub it in, then go over it with your finger or a paper towel to remove the excess. I bought some at the 99 cent store and you get 12 colors for a dollar. When I was googling around for ideas, nobody mentioned modeling clay.

Then I found some of my kids modeling clay next to their paints and tried rubbing that into the recessed text, and it worked great. Then I tried rubbing paint over the text, but that didn't work, it just made the whole thing white-ish. The paint was absorbed by the print and it made a total mess. I bought a syringe pack and tried to carefully inject paint into the recessed text, but that didn't work at all. I don't have an MMU to print multiple colors. I have been using embossed (or sunken in) text in my Fusion 360 designs, but I needed a way to fill them in with a color to make them pop.

Prusa fusion 360