Strange looking artifacts on two edges of a cube

Hi everyone,

I've recently build my first Prusa i3 clone, and I'm having a strange printing issue. Any suggestions would be very helpful and much appreciated!
The problem:
When printing a cube, two of the edges (the two vertical edges pointing towards positive y axis) look bumpy and ugly, while the two other edges look fairly straight.
Please check the photos.
I'm printing PLA @ 185C. I've tried to turn the xy-jerk and acceleration down, which made it slightly less apparent. Slowing down the print speed also seems to help. But so far I have not been able to remove the problem, so it would be nice to find the underlying cause.

Thanks for any suggestions!

Edited 1 time(s). Last edit at 01/28/2017 01:25AM by tuck2001.

Sometimes overextrusion can look like this. You should try to decrease the flow to 90% or 95% and see if it something changes.