Unwanted seam appearing in prints on FFCP

[Horia]

Hello, I encountered a problem in my prints.
Here are some photos:
https://drive.google.com/file/d/0B0w...ew?usp=sharing
https://drive.google.com/file/d/0B0w...ew?usp=sharing
https://drive.google.com/file/d/0B0w...ew?usp=sharing
https://drive.google.com/file/d/0B0w...ew?usp=sharing
https://drive.google.com/file/d/0B0w...ew?usp=sharing

I am using Simplify3D as a slicer.
I printed the handle for nylon bags a few times and every time the seam was there. I changed the orientation and the seam didn’t disappear.
After that I printed 2 coat hangers and again the seam was there.
The Z seam is in another spot and has nothing to do with the continuous seam seen in the pictures.

Is this from the slicer or the printer? Anyone encountered this in their prints?