Welcome to the Apple Support Communities. It looks like no one has answered your question. Perhaps if you provided some more details, the community would have more information to work with.
You state when you installed iOS 11, that you get tiny pictures from your printer.
1. What printer is this, does it have AirPrint?
2. Are you printing from your iPhone or are you importing to your computer first and then printing? If you are printing from a computer, is it Windows or Mac?
3. Did this previously work or is this the first time you're setting this up?
Best wishes.