Designed from Adam Savages one day build:
https://www.youtube.com/watch?v=V0kQDCVU_48&t=1505s
dimensions taken from adam's measurements
Print parts separately, or for more adventurous printers, you can try the closed version!
Goes perfectly with a Matthews 5" Pocket C-Stand https://www.msegrip.com/products/5-pocket-c-stand
The author hasn't provided the model origin yet.