This is an improved finderscope mount for a 26mm finderscope. It is designed to offer more movement and will fit on standard dovetail mounts on your telescope.
I did it in PLA with 100% infill for the top end pieces and 50% on the dovetail.
You will need an M3x20mm screw to assemble it. M3x16mm also works, it just won't give as much support.
I used a half round file to clean up the inside of the scope tube to make sure there were no obstructions when putting the finder scope in.
There is a 26mm and a 30mm version for the scope tubes.
I have not tested the 30mm, I based it on the specs I did for the 26mm one.