Need a place to keep a few bills or a credit card safe from household thieves? Print yourself a compact disguise. This CD holder has a secret compartment. Note: You will also need superglue and a small pen spring. Designed by Alex L., grade 12 drafting and design student, using solid edge. Printed on a makerbot 2 3 shells 10% infill .20 resolution 230 nozzle temp Get a small spring from a pen. Insert it with the peg into the matching hole so that the peg is pressed inwards toward the rest of the tray. Put the moneytray in behind the peg. Glue the Separator in place with some really strong fast bonding glue ...like superglue!