Initial self-test fails: Error check X-Axis Length

I just finished building my MK3 i3 kit, and upgraded the firmware to the latest 3.1.2. Next, I tried going through the wizard, and the self-test fails after moving the extruder back and forth a couple of times, and then it stops with:

Selftest error!

Please check :

Axis Length

Axis x

Any ideas?

Thanks in advance-

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Chosen Solution

Hi Nick,

turn the printer off (unplug it) and slowly/gently move the Extruder (nozzle) to the left and to the right edge of the heatbed and check whether you can feel some increased resistance.

Let me know about the results. You can also tape a video from the top, so I can check if the Extruder moves to both edges.

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Most Helpful Answer

New Firmeware 3.1.3 for MK3 fix the issue for me.

prusa3d_fw_3_1_3_mk3.zip

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After I loosened the pressure on the linear bearings, I got the calibration tests to pass. I will be upgrading to the latest firmware tonight. Thanks Klaus!

Nick-

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Hi Jakub,

Apologies, I had a lot of fun getting to this thread :-)

Yes, the extra resistance was EXACTLY the issue. I ended up loosening some pressure from the back plate of the extruder assembly to free up the bearings, and then everything started to move a lot freer. Initially, I was worried that somehow the smooth rods were bent, but once I re-ran the initial calibration - everything is now working perfectly.

I will also upgrade to the latest firmware tonight.

Cheers,

Nick-

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Hi Nick, great news! Enjoy the printer ;)

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What does it mean to loosen some pressure from the back plate of the extruder assembly? What exactly did you do?

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@apegamer

I had this same issue: Auto Home - X Axis Not Fully Home and I found that loosening the 5 screws that hold the Extruder back plate on was what worked. These screws are installed in step 5.37: 5. E-axis assembly

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Nick Nikzat will be eternally grateful.
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