I've been filing my tax with turbotax for about 4 years now. And I've always assumed that I was able to print out my 1040 anytime I want (when is needed).

If you go to the end of the return under "File" after "We're ready to file your taxes" and click on "Continue" on the next screen if you look just above where it says "Back" there is comment that says "Need to print for review?".  Select this option and you can print your 1040.  Hope this helps.