I have no idea what the humidy is (nothing extreme I would guess as I do not see any reason for this, I am in Cologne/Germany), the temperature in my studio is quite constant at around 20 C degrees as the printer stands in a nearly dark room only with an inside-window to the studio area itself. As I never had problems with the roller marks I did not check this.
The ink on the print on the photo was dried for 4 hours. A drying time of 5 minutes, none in fact, with another print ended up being less damaging but also was far away from acceptable.
Maybe a solution with no rips, a plane thin plastic piece lying over the area with the rips could solve the problem.
Ernst, if you do not have these problems, why? Donīt the rips in your printer touch the paper? Which dou paper did you use?
Mike, thanks for the info, good to know that I am not alone... ;-) But giving up on printing double sided would put in question the whole case of buying of the machine.