A client of mine needed a “looks-like” prototype of a bicycle brake light designed and fabricated, but they wanted to make sure a smaller (already manufactured) LED light could be installed inside to simulate the brake light being activated. My solution was quite simple, and was comprised of a simple cup with an extruded cylinder coming out of the bottom which the existing LED light could be fastened onto with friction, and a translucent cap. This design was meant to be pushed into a tube/pipe with the red cap facing away from the rear of the bicycle. The end result worked nicely, and I even adjusted my 3D print settings to give the end result a nice “reflector” style look. The images below show wireframe views of the cup and cap (top left and right), and photos of the assembly in daylight as well as lit up in the dark.
