Modular stoplight parts. I was finding the models on Thingiverse didn't quite fit what I wanted to do, so I made this modular stoplight part that anybody can customize their own enclosures for. Included is a common 3-high frame enclosure with a 5mm diameter hole in the bottom for mounting; it comes in two parts. There are four permutations of the light modules: Made for 5mm LED or open, and made for the lens or without (plain). Also I included a lens that can be printed in clear PLA to act as a light diffuser. The lens should press-fit, depending upon the tolerances of your printer. The frame halves have to be glued together right now.
The modules are 25mm in size; the frame is 29.8mm wide. I included an early 123d Design source file; I'm still working on this one.
If you have a particular scale you would like this in, request it and I'll see what I can do. Be patient! :-)

Should build well in PLA or ABS. I recommend clear (plain) PLA for the lens.