Bit of both, but mostly the printer - not in any way denying my own culpability there. However my point was that Joe Public will trundle through the online checkin process, print off his boarding pass, and as long as it is reasonably readable to the naked eye march up to security with it. As security queues at MAN in the summer are notoriously long at times, you can imagine the reaction of many passengers on being told to go back to check in after having spent half an hour waiting.