Summary

Build my own LED-mount for my Ender 3 S1 Plus.

You have to print the bar twice (with support for the Connectors)

And 2x holders (one mirrored in your slicer).

I've uses a mini-switch like: https://www.ebay.de/itm/234521726872

You also need a LED-strip (24 Volt).
I've used a step down converter to get 12V directly from the mainboard, which is placed inside my printer.