The sleeve is pushed over the hinge of the rack to prevent the rack from collapsing unintentionally. Unfortunately, the plastic sleeve was not UV-resistant in my case. The spare part consists of two parts so that the stand does not have to be dismantled.
The two parts are screwed together with two 3 x 14 mm PT screws.
Print with PET-G. Or even better with ASA for maximum UV-stability.
Translated with DeepL.com (free version)
The author marked this model as their own original creation.