Inconsistent Layer Issues
These lines could be caused by a mechanical issue with the printer; it looks as if the positioning is not up to par. 

This can be related to loose belts of the X-axis and Y-axis, or play in your system, e.g. look at the rollers of the carriage.



I've experienced an issue with play between the idler mounts and the smooth linear rods on a cheap 3D printer kit myself, but that is not the case here. Just added to explain where play may come from.