Just a very quick hack using Prusa slicer: a cylinder and a negative cylinder give a ring. The ring is pushed on the bolt of a sink plug to fix the strainer basket to it. The original connection broke away and not other sink plug seems to fit.
Thickness: 3 mm
Outer diameter: 11,5 mm
Inner diameter: 7,5 mm
Printed using TPU (Filaflex Filatech40), 0.05 mm layer height, 3 perimeters.
I doubt that a rigid material stays in place.
The author marked this model as their own original creation.