Beside the button that says "Follow This Thread", you'll see "Thread Tools", click on that and choose "Export Thread". There you'll find the entire thread in a text box . From there, you can copy and paste certain posts (or the entire thread) into a text editor like MS Word so that you can save it, print it, whatever.
I hope the Printer-Friendly view we had in the prior generation of this forum software comes back in a future release. It's a feature that I see in just about every other forum I participate in and is more convenient than the copy/paste workaround.