Dell 3010cn - Color Laser Printer Manual page 32

The center output tray holds up to:
2
250 sheets (20 lb (75 g/m )) of plain paper: or
l
20 sheets of transparency: or
l
20 sheets of label: or
l
10 sheets of envelope
l
Using the Support Extension
The support extension is designed to prevent print media from falling from the printer after the print job is complete.
Before printing a document, make sure the paper extender is fully extended.