We saw some people with printed tickets go through the turnstiles a couple of days ago and since I saw your query before we went to Disney, we stopped to watch the process. The CMs took the printouts to scan the barcode printed on it, let the user through and handed the printout back to them. The CM didn't give them anything until they said "Fast Pass?" Don't know whether the tickets they handed over would allow access to the park or just retrieval of fast passes - so maybe you might have to bring the printout each time.
At that time there were a lot of people queueing for the main turnstiles and only those three going through preprinted tickets, so you get the benefit of quicker access (well, at the moment anyway).