So I wanted to try out modelling the lens cover for the Quest 3 to conform nicely to the default interface but using simpler shapes so it's easier to edit / play around with.
NOTE: I've only tried this with the silicon facial interface (which should be pretty similar to the default interface). So try with other third-party interfaces at your own risk.
I've made this easy to pull out - so while I think it fits nicely as is, it will fall out with very little convincing. Not recommended for keeping the lenses protected while transporting.
Technically you don't need the extra contouring into the device (I just used them to lift away from the lenses a bit more), so I've added a flat version which should do the job just fine. I did test this (it's a little larger to fit the Quest 3 a little tighter) and it shouldn't touch the lenses until you press/flex it.
Open to remixes - feel free to open up the proximity sensor or even have some attachments like what was done on the previous Quests.
STEP file is there for further edits.
The author marked this model as their own original creation.