This holder is designed to clamp onto a Losmandy D-style dovetail and hold the Pegasus Astro pocket powerbox V1 (the plastic box version) and a Kensington 4-ports USB 3 hub.

This hub to be exact : https://www.kensington.com/nl-nl/p/producten/connectivity/usb-hubs-accessories/uh4000c-usb-3.0-4-port-hub-charger/

FlashForge

Adventurer 3

No

Yes

0,2

40%

Print the holder with "AstroDude" up.
You'll need to add a support tree-like structure into the the Hub-part of the design.

The holes of the clamp need to be taped, I think it was M5.