Maybe you could redesign it so that it somehow latches after attaching, with a sort of snap-fit lock? So it would become a closed circle. That would largely prevent deformations.
Almost all plastics will deform under continuous unbalanced load, and especially PLA and light-cured resins.
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XYZDesignPro 70
My go to tough material is PETG. I have printed feet for patio furniture with it. Drag them around on concrete. But Nylon may be your best bet.
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