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I just re-ran all basic calibration steps from the Original Prusa i3 MK2 Manual.

Now, when doing the first layer calibration, lines that are running in positive X direction are ok, while those running in negative X direction are severely squished.

Print of the default V2Calibration.gcode file on my Prusa i3 MK2 (The "waviness" of my print bed is an artifact of the camera lens distortion of my smartphone)

I already did Bed level correction, so each line is exactly the same width over its entire distance and tried to raise the live-adjust Z, but that leads to the thin lines not adhering at all. My printer is 100% stock, I modified nothing about it.

What can I do to troubleshoot this further?

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    $\begingroup$ do you have any play on the head? $\endgroup$
    – profesor79
    Jun 29 '18 at 12:51
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    $\begingroup$ Can you check the g-code to be sure the head speed remains the same for movement in both directions? $\endgroup$ Jun 29 '18 at 13:49
  • $\begingroup$ @profesor79 I tried to wiggle it, but it stays put. My current assumption is a damaged or partly clogged nozzle. $\endgroup$
    – iFreilicht
    Jun 30 '18 at 20:57
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    $\begingroup$ Check the nozzle. I scrached my nozzle over the metal heat bed by accident...it becomes nasty... and produced inconsistent line widths. Since the metal of most nozzles is brass it is easy to machine...and easy to deform. And since you will need several nozzles over time get some new ones and try with them. $\endgroup$
    – Horitsu
    Jul 2 '18 at 4:58
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    $\begingroup$ @Horitsu Apparently this has led to fixing the problem for the OP, please consider posting a proper answer so that the OP can accept it. $\endgroup$
    – 0scar
    Aug 3 '18 at 7:16
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Due to the advice from @0scar i formulate my answer in the comments as a proper answer ;)

Check the nozzle, if it is in shape and good condition. I scratched my nozzle over the metal heat bed by accident...it becomes nasty... and produced inconsistent line widths. Since the metal of most nozzles is brass it is easy to machine...and easy to deform. And since you will need several nozzles over time get some new ones and try with them.

Also not every new nozzle will be perfect, so defect products happen, especially if they are cheap and have really tight measurements.

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As pointed at by @Horitsu, the Nozzle was the problem. Its outflowing hole was not perfectly round anymore, leading to a higher extrusion rate in one direction than others.

I exchanged it, and now everything works great again!

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    $\begingroup$ @Horitsu has led you to the solution to solve this, until he has not posted an answer it is allowed to accept your own answer! But when he does answer the question, accepting his answer is the proper (nice) thing to do from a gentleman's point of view. $\endgroup$
    – 0scar
    Aug 3 '18 at 7:20
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    $\begingroup$ I see that @Horitsu has posted his answer, please be a gentleman and accept his answer instead. $\endgroup$
    – 0scar
    Aug 4 '18 at 15:07

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