Here are the most important considerations:
Width: The text-only page should print in a legible format on a standard sheet of paper. Keep in mind that pages designed for an 800 pixel computer screen may be cropped or scaled to fit the printed page. To be safe, limit your line or table width to about 500 pixels.
Left-justify text: This increases readability.
Site navigation: Avoid dead-end pages! Give visitors a way to navigate back to the previous page.
Color: Use black text on a white background for a good contrast on the printed page.
Citation information: Researchers may need to formally cite your work in their documents. Simplify that by including the title, author, date, and URL on your print-friendly page.