I made moveable D rings for ProfessorBoot's semi-trailer. Used 22 of them for my bed size. Takes about 5 mins to print them. Found that printing with supports was best. Is more to help with bed adhesion. Printed with a Bambulabs P1S. I screwed mine to the bed but you could glue them too.
The author remixed this model.
Is an added on I made for the trailer.