Same problem, fixed for now using 5 minute epoxy... Slid the gear to the side... Dabbed epoxy on the axis, slid it back in, let it dry overnight. Taking the printer appart is a pain though... All that for a 1 cent plastic part that is an engineering defect ! Mise à jour (15/01/2016): Well had to redo it tonight after printing out a good number of pages... Here are 2 pictures to illustrate how to do it without taking it apart but by using a mirror to see the gear. Global view to see where to put the mirror and where the gear is. Zoom in on the mirror and you can see the gear and epoxy as it dries. You can use the gears to the left to rotate the axis and dab it homogeneously. With the mirror it was real quick... Now lets see if it worked again... Regards