Adapter Eachine EV800D sang Quest 2 facial interface

Excuse the poor geometry, I went more for it working than for looks.

To get the lens out of the goggles you need to unscrew these screws and essentially rip it apart (it shouldn't damage it)

You might need to remove the fabric

You can then slide the lens into the slot on the front, make sure that there is enough clearance and you sanded the slot so you don't scratch it like I did while prototyping

Also hot glue some velcro to the facial interface thingy like seen in the picture

Now you can just stick the VRcover onto there

To prevent light leaking you can add some black tape (or some other color) on top of the lens slot and add a light blocker on the nose part.
I made one using black electrical tape as well.

Also glasses semi fit, you just gotta put them in before you put it on

If you want to know how I printed it, I attached the .3mf project file I used to print