With regards to mechanical problems, I am quite close to the beginning of the roll, having used less than 30 feet. I examined the raw paper before printing, but putting the 60x40 board against the printer at a 45 degrees angle, and then rolling out the paper over the printer and onto the board. The result is that the paper itself just doen't appear perfectly flat to my eyes. There are already a couple of waves parallel to the axis of the roll, as well as other ondulations perpendicular to it. Is it normal ? I would tend to think that if the paper isn't flat before printing, why should it be flat after printing ?