[Paul] used a 4″ (10 cm) clamp; that which looks fine for a wide range of boards ... We’ve seen a lot of PCB vises come and go, using everything from scrap wood to 3D printed compliant ...

Once this is complete, the wood is secured to the CNCs work area ... have already cutout and hence isolated part of the board from the PCB clad! Honestly, I haven’t felt the need to purchase ...