Check Raw models sections

Cannot upload “preview plate”, cause it's not printable

Reupload of original made by Adam & Evil. 3mf format for Bambu/Orca slicers
Added assembled plate (not printable!), may help someone to choose colors of your print

Also can help someone to assemble entire strap.

Added tolerance calibration plate

Original model designed for printing in PLA/PLA+
I've printed in PETG on X1 Carbon and that's fit fine

No supports or metal screws needed.
Some models are pre-supported

Original printed in 15% infill
I've designed for 10% infill in gyroid, that's a bit lighter but still enough strong

My thanks to author of original model for great project

Weight:

1. All gears and movable back panel: 127.61g
2. Strap and hair-protector: 154.97g
3. Covers and quest3-holder: 76.64g
   Total: 359,22
    

You can experiment with different settings for more light-weight print

All strap fits nice, maybe back-panel need some sanding

WARNING. 
MainFrame plate can display warning about supports, just ignore it
It's prints fine