I'm going to 3D print my tail lights (Yes I'm nuts)

Worst case scenario, I think I have seen "chrome" paint in a can somewhere out in the market meant for I think interior trim in case you really wanted to go that route. I am a huge fan of the printing in one piece and having it body color trim. Watching!

Yeah, I couldn 't really think of a way to paint the trim to look like chrome that I thought would stand up to the elements...but I haven't looking into it much