The Quest 3 has a critical flaw where the mounting point for the strap that stops the headset from sliding down your face eventually breaks apart and cannot be repaired or replaced. I tried https://www.printables.com/model/1306387-quest3-repair-of-the-attachment, but that part attaches onto the face gasket instead of the headset and my adhesive does not adequately bond my PETG to the face gasket plastic.

The new mounting point fits under the mounting point for the Vive/Tundra tracker. The spacing is very tight. I needed to remove the D ring from my tripod mount screw to fit it into its recessed hole. I used micropliers to pull my BOBOVR M3 Mini strap through its mount point.

I printed it in PETG and it hasn't broken yet.