(Follow the first 4 steps of the cardboard disk tutorial) Print out your PDF pattern and cut the disk shape out along the outermost circle. Place on top of your foam and trace the circle using a felt tip pen or fine tip marker. Cut the pattern down to the next circle and place it in the center of the first circle you drew. Follow the lines on the pattern to draw the cord slots around the disks edge. Cut the pattern down to the innermost circle, place in the center of the foam and trace.
Using a sharp craft knife trim away the excess foam from the outer circle. Next use the craft knife to cut the slots around the disk’s outer edge. Cut away the inner circle with the craft knife as well.