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? Don´t 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.
Thanks, Clem