This is a LED light strip mount, which fits 10mm width and 20cm length of strip. It can be screwed onto everything with some cuntersunc screws. The strips lays in a slot. Calibrate your filament, so the fit isn't too tough. The diffusor should snap into the mount part nicely.

Here is a link to the strips i used: https://www.amazon.de/gp/product/B0B6TZJZ9G

I added the step-Files if you want to adjust the model.

There are two print profiles. One which just offers one strip mount (20cm) and another with 5 pieces (1m).