This is a Quest 3 and Vive Deluxe audio strap adaptor. It allows for usage of the Vive DAS on the Quest 3 and has room for cables.
The link cable will need to be attached to the headset backwards. I'll look at creating a variant that has a clip to assist with link cable routing and a smaller clip for helping guide the audio cable.
You will need a 1 inch wide Velcro strap to connect the DAS Strap adapter and the Quest 3 center strap rod. https://www.amazon.com/gp/product/B00I0TTPL8/
There are 2 options for audio cable routing, One is to just get a extension cable and the second is to reroute the cable through the DAS to the other side. This supports both.
Photo is just the fitting on a store unit by the original creator over on reddit. I have altered it so the design is more compatible with cables and different audio routing.
Recommended Print Settings:
.16 mm layer Hight
Supports
The author remixed this model.
Revamped left side to have better support for USB-C Cables.