@En0a If your printers support vertex color printing. In 3DC you can vertex color paint (polypaint) the sculpt room surface mode models. The vertex color will be exported in the file. several file formats support vertex color. I do not know the file format that your printers support. Model in first picture is vertex color painted.  The other workflow would be the same as one I gave Phil minus the Blender part as you want just to paint some color variations. I do not know how