BNC Cap - Siglent Test Equipment Accessory

I have a few pieces of test equipment in my lab that utilize the common BNC type connector. The problem is that the connectors, when unused, are commonly left unprotected. Enter 3D printing. This little cap slips on and then twists to lock in place and keeps my BNCs dust free.

I tappered the top inside edge of the horizontal portion of the internal channel, this allows printing without support; face down. 

For the contest, I wanted to make something small and simple enough for everyone to try and print (i.e. get some makes). I also wanted the model to be unique and useful. I find the cap very useful but it's not unique. After designing it, I found there are other bnc caps already out there. Oh well. To make things unique and push myself, I wanted to try adding multiple colors. 

The problem now is that I don't want multiple layers of color as traditionally seen with single extruder printers, I want to inlay multiple colors in one layer with one extruder. I remember seeing Devin of "Make Anything" demostrate a technique but I don't use the tools he uses or really remember anything other than multiple colors on the first layer is possible. I am playing with SketchUp and manually merging gcode sliced by Prusa Slicer. It works out really great. I've included a “Happy Face” cap for you to try.  It starts with the face color (yellow), then has you manually change to the base color (black).