You can save and print in the Free version anytime up until TurboTax shuts down, which is around mid-October of every year. If you purchase the PLUS add-on, it'll give you access to your tax return after the shutdown (just like Deluxe and higher versions).
So to answer your question, if you are using Free and want to save your return anytime between now and mid-October, you can do so, just like the paid versions.