Did you e-file the amended state return? To be fair, this is the first year TurboTax has allowed e-filing amended returns, and I have no idea if that extends to state returns. In any case, if you e-filed it, you should have received a confirmation of e-filing.
Lacking that, then, yes, you must print, sign and mail your state return - otherwise the state would never know that you made those changes.
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