We get that question a lot. We have been looking for ways to provide printing, but are not sure exactly how or what people are looking for exactly.
Are you interested in printing an entire lesson with the notation, or just the notation? Or both?
You can print a lesson with the teachers comments and the notation images by right-clicking on the text portion of the lesson and selecting "print".
Or you can capture the lesson screen with alt+printscreen on the keyboard. You can then paste it to the paint program that comes with Windows and print from there.