Dell 3100cn Color Laser Printer - Manual (Page 213)

4. Close the inner rear cover.
5. Close the duplex module.
6. Grab the feeder cover on the back of the printer and pull down.
7. Remove any accessible print media.
8. Close the cover.
When Not Using the Optional Duplex Module
1. Open the rear cover. The inner rear cover opens at the same time.
2. Remove the print media from the back of the printer. The accessible portion of the print media determines how it should be removed. If the print media
is not accessible, go to step 3.