I purchased a couple of blank LED cross PCBs at a Hamfest a couple of years ago with the intention of installing them in my truck as assisted brake lights, but being lazy... that never happened.

Fast-forward to 2017 and I have a new 3D printer... aka a new toy. What a perfect time to do something with these crosses. The cross is designed so that the PCB sits down into the cross and a thin backplate snaps down on top of it. When powered up, the LED are clearly visible through the thin front layer.

You can get the PCB kit for this directly from the company here - http://vakits.com/led-crucifix-5mm