To combat paper curl make the following adjustments.
- If printing one side only try delivering face down rather than face up.
- Change the output curl adjust, Adjustments on the main screen, Machine Adjust, Finisher Adjust, Output Curl Adjust and select the opposite to what is currently selected.
- You can also reduce the weight of the paper on the machine which will reduce the fuser temperature, if printing onto a coated stock make sure that the toner doesn't scrap off after printing.