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MK4 x axis self test failure  

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Gregory Verba
(@gregory-verba)
Trusted Member
RE: MK4 x axis self test failure

Sure.

It was uploaded to Printables:

https://www.printables.com/model/596813-mk4-loveboard-cover-right-mod

Posted by: @magnaticpro

Hi Gregory,

Would you mind share your re-design? I got the same problem, thanks in advance!

 

 

Posted : 03/10/2023 5:27 am
rsilvester
(@rsilvester)
Active Member
RE: MK4 x axis self test failure

Rolled back the firmware as suggested, get 'Homing error X #13304'.

The X axis is much stiffer than the Y axis, takes significantly more force to move it manually.  It glided very smoothly before the belt and motor were added.

Posted : 04/10/2023 2:43 am
vanalten
(@vanalten)
Member
RE: MK4 x axis self test failure

Additional reason found for suddenly failing self tests, the prusa tool holder from printables.  Hope I can save somebody else half an hour of head scratching with this comment. https://www.printables.com/model/547500-prusa-mk4-tool-holder/comments

Posted : 08/10/2023 9:00 am
rsilvester
(@rsilvester)
Active Member
RE: MK4 x axis self test failure
Posted by: @rsilvester

Rolled back the firmware as suggested, get 'Homing error X #13304'.

The X axis is much stiffer than the Y axis, takes significantly more force to move it manually.  It glided very smoothly before the belt and motor were added.

Finally tracked the issue to a badly seated pulley on the right hand side.

Posted : 08/10/2023 11:33 pm
TonyW
(@tonyw)
Member
RE: MK4 x axis self test failure

I had exactly the same problem. I think this is a very poorly designed part. The single screw can't hold this flush, and the Lovebird cover doesn't fit well enough to hold it in place either. I don't know if this is due to my poor cable routing skills but this feels like something that needs to be looked at.

Posted : 17/10/2023 11:04 am
Lex
 Lex
(@lex)
Active Member
RE: MK4 x axis self test failure

I can't get past the X self test either.  I've been printing for 3 days and everything is perfect. Not passing the self test is making me nuts though because I have to skip the test every time I turn it on.  I went through all the suggestions in this thread and I did have a slightly misaligned cable holder.  I fixed that and got that last mm of movement and it still fails.  There is nothing left int he way it comes in full contact with both ends.   Is there a way to permanently cancel this test?  I really don't even want to pass it anymore as the printer is performing perfectly and printing all of my models flawlessly.

Posted : 24/10/2023 12:56 am
Lex
 Lex
(@lex)
Active Member
RE: MK4 x axis self test failure

I came back to say that the new firmware fixed the problem.  I passed the self test as soon as I installed it.  Thank you to prusa programmers.

Posted : 07/11/2023 2:38 am
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JMH714
(@jmh714-2)
Trusted Member
RE: MK4 x axis self test failure

Ran into similar issue. My issue was too tight.

The phone with microphone to test how tense belt is - it wasn't accurate. I had it on green when I did the strumming and the test failed. Then I loose it by lot and got it passed. 

Posted : 12/11/2023 10:48 pm
fstephenson
(@fstephenson)
Member
RE: MK4 x axis self test failure

This turned out to be my problem

Posted : 15/01/2024 6:31 am
Katakana54
(@katakana54)
Active Member
RE: MK4 x axis self test failure

Just saying that this was exactly my issue. I replaced the bearings on the extruder, then zipped the wires in the back, but did not pay attention so they fit exactly in those holes. Damn tolerances...

Posted : 19/05/2024 5:41 pm
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