This spoilboard is used to take the abuse when you cut through your workpiece. It was designed to fit directly on top of the bed of your MillRight CNC M3. It’s made from 3/8″ (about 9.5mm) thick MDF so it creates a great buffer to save your machine’s bed without consuming too much Z travel.
The counterbored holes allow a for a #10 washer and screw head to sit below the surface. This way you can mount the spoilboard to the bed and have a flat surface to lay your work onto that’s ok to cut up.