Dell 3000cn Color Laser Printer User Manual page 44

5. Remove the printer from the tray.
CAUTION: Lift the printer with two people, one facing the front of the printer (operator panel side) and the
other facing the back. Never try to lift the printer while facing its right and left side.
6. Attach the trays together by installing the optional tray you just removed on top and inserting the two screws provided.
Tighten the screws with a coin until they are secure.