Bushings give out on these. Here's a replacement. Print solid or close to it.
Chair in question: https://www.amazon.com/Mayline-TSM2BB-Mid-Back-Arm-Chair/dp/B00368Y6DA
Mine disintegrated after a while in PLA. Consider something with really good layer adhesion, like properly tuned PETG. YMMV.
Category: Replacement Parts
The author marked this model as their own original creation. Imported from Thingiverse.