I’d be wary of 3D printing this part, mostly with the stresses applied and difficulty to access/replace. Not saying it can’t be done - If I were doing it, I’d print it in nylon or something reinforced and be careful about the orientation of the part.
You might try using a flat or corrugated metal piece with some roughness for the plastic to grip to. I’m guessing it broke at the repair and the pin pulled out
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