Note: Use the teeth or non-fuzzy side of velcro for the first part of this step.
Start by covering a 3.75" x 5.75" area on the back side of the white acrylic with the adhesive velcro (corresponding to the blue rectangle in Figure C).
Then cover the rest of area around the velcro with double sided sticky tape (the yellow-orange area pictured in Figure C).
Now place the velcro and tape side face down into your laser system. Open the countdown_file3.cdr and send it to the system using the appropriate settings.