[batchelc] decided to make his own large-scale CNC Foam Cutter and took a lot of photos along the way. Since machine is 4 axis ... just a few thousands of an inch in front of the wire resulting ...

Set the blade so it goes one-quarter inch through the bottom of the plywood. This will give you a nice, crisp cut. A full sheet of plywood is 4’x8 ... piece of extruded foam as a backing ...