Printerbots Delta Kossel 250vs / Print Ridges

[prjoe]

Hello all,

New to this great hobby, but it's turning not so fun anymore. I'm printing 1.75 PLA on .35 nossle There's no way I can get my Kossel to print smooth layers. My first 2 0r 3 prints were nice and smooth. Then I really don't know what I did but started to loose quality, to the point where my prints have sorts of ridges on the sides (I've attached pictures for refference) I've :

The printer was auto-leveled with FSR's to a .01 precision.
Changed temperature,
Changed slicer
Changed Speed
Changed the perimeter % for the slice
Re-torqued all the frame screws
Bed doesn't seem to move
The mag arms have no play
The belts are tight (Not that stretched either)
It's very strange my first print were acceptable, but the rest are just worthless.

I honestly don't know what else to look for, I've changed so many things that I don't remember the settings I had that worked.
Any ideas what to look for will be appreciated.

Regards.