Roof window jalousies usually hang in the degree of the roof down from the window and to fix their lower end to the window they need this cap at the end of each side of the lower bar of the jalousie. If you look at the photo with the yellow jalousie you know what I mean.

The hole can be drilled up a bit, I needed to drill it to 2.9mm to fit to the pin fixed at the window.

I printed it with 100% infill but for whatever reason the line is not closed at the top - nevertheless it fits perfectly and holds very good.

I couldn't upload the Blend file because the website here doesn't recognize the file format. Maybe Blender 5.1 is too young... :)

Maybe useful for someone to repair the jalousie :)