Skewed prints or even complete offsets

[mario-herger 0]

I got my Ultimaker 2 two weeks ago, and then on the fourth day it started to skew prints. Now it's so bad that already the third or fourth layer starts being off and reaches the borderline. And it's just one axis.

I've browsed the forums (both in German and English) to find a solution. Tried oiling the rods, looking at friction, moving the bands, to no avail. Any ideas?

See the attachment:

 

[IRobertI 428]

Check your pulleys:

http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#shifted