Vanguard QS-29 compatible QR shoe
A Vanguard QS-29 compatible Quick Release shoe.
Useful for securing a DSLR camera body, onto a "Vanguard" proprietary tripod head.
Refer https://www.vanguardworld.com.au/photo_video_au/qs-29.html
As a photographer with multiple camera bodies, too many QR shoes is never enough :D
Also, the best thing about so-called 'standards' is that there's so many to choose from.
Note: In addition to the 3D-printed baseplate, you will also need a stainless-steel D-ring screw, with 1/4" UNC thread. Such hardware is readily available from camera-store, or easily sourced from eBay. See photo.