Here is a possible answer for duplexer shifting problem on a 3100 cn

 

Try below to fix printing shifting problem if you use duplexer

 

You have to go into the printing preferences and click on the “paper” tab. Click on the Margin/Shift margin button. Click on the Print position tab and make sure your position is set to “centered”. I was having this same problem until I changed this and it is now fixed.

 

:smileyhappy: