After modifying and printing https://www.printables.com/model/251018-ryobi-random-orbit-sander-r18ros-expanded-dust-por I figured out that I don't have the R18ROS but the RROS18 from Ryobi. Even it looks like a small difference… it's a huge one.
For this Ryobi model I created a completely new dust port connector for Miele vaccum cleaner hose.
I printed it with PETG at a layer height of 0.25mm with 0.4 mm Nozzle and 4 perimeters (therefore no infill) in 47 min.
The author marked this model as their own original creation.