If the airport has the quick check-in kiosks, you can type in your confirmation number, and even if you have already checked in online, it will allow you to print another boarding pass.
Orlando airport has these quick check-in kiosks.
If your are checking luggage then you need to go to the ones closer to the regular check-in lines.
If you are not checking luggage, there are a set of kiosks that are actually closer to the security line.
Carol