I added missing hole for LED light to Kleinkünstler's Hormann HSE4BS replacement Cover.
Material: PLA
Layer height: 0.2 mm
Perimeters: 3 (or more so everything is a perimeter)
Infill: all should be perimeters
Supports: I used tree supports and angled the model at 25°.
If you broke yours like I did, here is a list of replacement parts I found and made to repair mine.
The author remixed this model.