This is a base plate to mount Sneaks's Bench Mountable Vice directly to Chris Borge's Open Ball.
It needs to be printed with supports, and then slides into the dovetail of the ball vice.
Update: I updated the model with version 2, which is a tighter fit to Sneaks's vice, which makes it less chunky
The author remixed this model.
resigned the base to mount directly onto Chris Borge's Open Ball rather than being bench mountable