I have an Ultimaker 2 Extended. I have printed about 30 successful large prints prior to this issue. I repeated the print as I thought it was a fluke but the same issue re-surfaced.
In the above image the item is supposed to be straight in the vertical direction, but it is printing the S curve about 1cm up from the start position. The above was repeated 2 more times in which I decided to post this asking for help.
One thing to note, I noticed that on the X and Y motor some Black Residue, not sure if this is part of the problem or not.
Thanks
Phil