I am not fully familiar with the Kindle or Nook but I have my digital books on my iPad. When I am reading my books if there is a page I want to print it gives me option to email that page to myself then I can print it from my computer.
If you don't have the option of email then download adobe digital edition for free at adobe.com. You can open almost any ebook with this program and while reading the book on your computer you will have the option to print the page or the entire document.
I don't even buy the paper books anymore because the digits are so much easier to store. In fact I have begun the process of digitizing all of my patterns and I view them on the iPad. The only thing I need to print are templates if they come with the pattern.
I love the digitals!