The trim rings that hold the door, wall, shower, and trim panels onto the Jayco Terrain and Entegra Launch Mercedes Sprinter Van RVs are cheap and thin plastic. These models provide a thicker, stronger retention to replace the OEM pieces. Recommend printing in PETG, ASA, ABS, or CF to withstand the heat of the van. The cap is pressure-fitted into the cup.
In the picture, the tan one is the original, thin, OEM piece, and the black ones are the 3D printed pieces.
The author marked this model as their own original creation.