We all know print is good, and reading from paper is part of the experience.
There is a superb piece by Ferris Jabr published in the Scientific American that has quantified the effectiveness on reading from paper vs screens.
The benefits of reading from paper were explained and had a measurable impact on students' information retention and learning. The article goes in depth on how the brain works, what we remember, and how we learn. It's lengthy and worth a look.
The gist of the article is that evidence is appearing that shows the benefits of paper over digital.
"In a study published in January 2013 Anne Mangen of the University of Stavanger in Norway and her colleagues asked 72 10th-grade students of similar reading ability to study one narrative and one expository text, each about 1,500 words in length. Half the students read the texts on paper and half read them in pdf files on computers with 15-inch liquid-crystal display (LCD) monitors. Afterward, students completed reading-comprehension tests consisting of multiple-choice and short-answer questions, during which they had access to the texts. Students who read the texts on computers performed a little worse than students who read on paper."
PrintMe1.com comes in to make it easy to distribute digitally, then gives students the option to print affordably.