The schematics of course is just a simple boost-LED Driver, but during design I focused on a deeply E-CAD/M-CAD Integration. Hence I have a perfect STL and Fusion360 File available in the end.

The LEDs are low-current ones, so the reach their full brightness at 2 milliamps to extend lifetime.

Of course, drawing 150 milliwatts from a CR2032 is a lot of current, but the cheap IKEA-Cells I tested are able to power the project.

I am currently planning to integrate the PCB into 3D-Prints and many other projects as it is extremely handy.