Okay, that makes sense. How big should the vac box be? As big as the cutting area? A little larger?
Here are some pictures of my current set up. I have my CNC sitting on a Particleboard table top, and in the picture below have 2 3/4″ MDF sheets on top that as the cutting surface (temporarily of course). Should the vac box be no more than an inch thick? Could I just make it out of 1 piece of MDF with the vac pattern cut into it?