This remix is to compliment the LED traffic light designed by Ataris which is here:

https://www.printables.com/model/336604-led-traffic-lights/comments/711448

I used the exact same format and extended it to include three lights. The stand is also slightly higher. It's just under 220mm long and fits diagonally across the bed of my Ender3.

I remixed the original lens to have a single layer for the transparent part - this layer is .12mm thick as this suits the minimum layer height for a .4 nozzle in my slicer. I printed the lens' entirely at that layer height and printed the housing part at .28 for speed.

The LED's I have are bright but have a 20 degree view angle. Because the view angle is quite narrow, I lowered the part that the LED's sit on to bring them deeper into the housing - this shines a slightly wider pattern onto the lens.

I soldered my wires with a common ground wire in black and each colour with a matched wire and 330ohm resistor. I soldered on crocodile clips as I intended to use with the microbit. This part is entirely optional and you could just power the LED's with 2x AA batteries. I've uploaded a screen of the microbit code I used to send radio signals between the pedestrian and vehicle sets to emulate a crossing.

Here is a video of the Micro:Bits in action.

Post print I did need to do a bit of clean up of some elephants foot. This can affect the holes that the LED's push through. I found that spining the tip of a new xacto blade in each hole cleared them, however if the holes are too tight for the LED's, heat up a sewing pin with a flame and push that through with pliers.