I am owner of a Skywatcher Heritage 130p. Since I live in the city and like to use the telescope from the balcony, I wanted to protect the telescope mirror from stray light.
I looked at some solutions in the relevant forums, but I wasn't completely satisfied with any of them. So I came to the conclusion to design something myself.

My Idea was to be able to clip something on the rails and use black fabric or foam rubber sheets. My first attempt was with 2mm foam rubber sheets and I am happy with it.

You need four of the brackets, and you have to glue them with the foam rubber sheet after printing. A hole must then be cut in the protection at the location of the focuser.

The design was done with OpenScad and should be parameterizable. It is not perfect but it works.

Feel free to adapt or remix the design.

Thanks, Enjoy!

Print Settings

Post-Printing

Prepare foam rubber

Before you start to cut something, it is best to measure again. The dimensions are without guarantee.

1. Cut 2 squares of foam rubber sheet 255mm x 255 mm
2. Cut the recess on the top and bottom left and right, 5mm from the edge, 20mm long and 4mm deep.

Glue togther

Glue the brackets together with the foam rubber. Use a suitable glue for this. I used UHU Allplast.
It is best to fix the foam rubber with the brackets during the gluing with suitable clips.