In his documentation, Lindsay referenced an antique design for a fractal vise, which is probably the one restored by Hand Tool Rescue in a recent video:
Now Christopher Borge, a product designer in Adelaide, has figured out how to 3D print a fractal vise. By going over the patent drawings of the Hand Tool Rescue vise, he reverse-engineered some dimensions and took guesses at the joinery and mechanicals.
He eventually opted to go with a twin-screw design.
As you can see, it works great:
Borge points out that it’s still a work in progress, but he’s posted the files to Thingiverse if you want to give it a whirl.