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

It will be interesting to see if they have good optical properties.

There are others that have printed brake lenses, so it's not unheard of...in the model I'm definately going to add the pyramid shaped indentations on the inside of the lenses that serve as a diffusion pattern on the originals. Checking what the light looks like coming through will all be part of the iteration process