I realized that one of the radiator covers was missing on my HD CVO Street Glide 2015. Since I would rather not wait for the HD Workshop to source a new part (not to mention the cost of original HD parts), I decided to try modeling one.
I tried to mimic the look of the original one by exposing the infill, and I am quite pleased with the result.
IMPORTANT: I would not do this for a functional part, but this is mostly esthetic, the biggest risk would be to lose it again (or maybe having it melting on the radiator, had I chosen the wrong material).
DISCLAIMER: Please note that I have used this for one week only: if it gets dislodged, and I lose it again, I will improve the design.