I can't print properly, i really need help

Hello,
It's about 3 or 4 days that I have problem when i print.
I can't print any piece properly, perimeters don't looks like very accurate and I already tried to change alot of setting in slic3r, i also recalibrate some constants in Marlin, but i still not have a proper print.
I really need your help, here is picures of my problem:




Some one could help me ?
I print abs, i tried 200°C, 210°C, 220°C, 225°C, 230°C, 240°C, but none of them give me a good print.
I also changed jerk to 10 in Marlin.
I checked twice extrusion step.
I checked Z steps also.
And many other things... I have no clue actually, i really need help

Thanks in advance

Clean the nozzle with acetone. There might be an obstacle inside.
-Olaf

Hello again,
I just adjust my belt, and now it looks better, but it seems that there is a problem in my x ou y axis:
[imgur.com]

Quote
o_lampe
Clean the nozzle with acetone. There might be an obstacle inside.
-Olaf

Yes my nozzle looks like a bit dirty, i will clean it i think.
Anyway i am gonna receive new nozzles soon, so i will try a brand new and let the old one in a acetone bath for a while to be sure ^^

Are you trying to print a 20x20x20 cube?
Then you have a long way to go through all the calibration steps.
Read Triffids calibration guide and the improvement will follow.
-Olaf