Credit to the original uploader, I have just made minor tweaks. The dependencies are the same as for the original model (do not forget to download the SVG).

You need to export an STL twice using the script by switching which part is activated. Open both STLs at the same time and, at least if you are using PrusaSlicer, you will get a prompt asking you if they are part of the same project (answer yes). After that you can assign different colours to the different parts. I find that I get the best print results by printing the surrounding colour first and subsequently the glyphs.