- Loosen the paper - Sheets can become stuck when placed tightly together for long periods of time in a printer draw. It can be helpful to periodically take them out and loosen the spacing between them.
- Keep paper cool - Paper should be stored in a cool, dry place. The lower humidity in these environments helps avoid paper sheets from sticking together.
- Align the tray - The tray should be aligned with the slider so the paper feeds smoothly through the printer.
- Choose the right paper - Different paper types suit different printers. It’s important to choose the right grade of paper for the machine being used. It’s also important to not mix different paper sizes in the one tray.
- Keep it clean - A clean printer has fewer technical issues than a dirty one. It should be kept clean with a duster and brush.
Source: http://blog.choicestationery.co.uk/10-tips-to-prevent-paper-jams/