This is about adding printer friendly buttons or making blog posts generally printer friendly. The way I’ve chosen to do it here is to use a service called PrintFriendly. The service will create printer friendly pages for any webpage or generate code so that you can add their services to either Blogger/Blogspot or Wordpress.com and Wordpress.org services.
Just go here: http://www.printfriendly.com/button, choose your service and follow the instructions.
While searching for this, I also found several other sites that seem to offer advice on how to do this.