Calibration Failed. Check the axes and try again.  

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chad.r7
(@chad-r7)
Active Member

This is driving me bonkers. And on top of this, this forum keeps giving me some Word Fence 403 error every time I try to post his message!

One day, after many successful prints, the hot end crashes into the bed. I've been struggling ever since to get this thing working (literally a few months now), to no avail. 

  • I did a full factory reset
  • Flashed firmware 3.9.0
  • Self-Test passes
  • PINDA light goes off when near bed, so I assume that is not the issue?

What else can I do?

Posted : 18/09/2020 11:19 pm
keri7240
(@keri7240)
Eminent Member

Nice video!

I think I see the problem...  mine did something similar after the 2.5 upgrade.

When you performed the Mesh Bed Leveling, the PINDA does not "line up" with the sense point on the bed, so it will not detect the height of the Z axis well.  It looks like the PINDA is a little too far forward.

If you perform the XYZ calibration, it will try to "find" the X and Y coordinates of the sense points and store them in memory.  If the mechanical adjustment is off by too much, this can fail.

My suggestion:

Loosen the large nuts that position the upright frame and the 2 lower Power Supply bolts and bring the upright frame about 0.5 - 1mm towards the rear, or away from the control panel.  Maybe 1/2 turn on the nuts.

Before completely tightening the nuts, move the bed so that one of the right-to-left lines on the bed lines up with the upright frame on the Right side, near the Power Supply.  Then, check to make sure that the Left side of the upright frame lines up on the other side of the bed. If it does not line up, adjust the Left side nuts to line it up. Then tighten the nuts and the Power Supply bolts.

Then, re-check the PINDA height with the nylon tie.  

Then, run the XYZ calibration. Ideally, when it is doing the slow initial search for the sense point the sweeping will be roughly centered over the sense point circle.

That's how I fixed mine.

Good Luck!

 

This post was modified 1 month ago by keri7240
¡no entiendo Español!
Nein! Nicht Versteh!
Я немного говорю по-русски но не очень хорошо, и...
I'm not very good at English either! Maybe someday I'll find a language I'm good at?...
Posted : 19/09/2020 1:24 am
chad.r7
(@chad-r7)
Active Member

So essentially you're saying that I need to physically align the bed to the PINDA? But when I go to Calibration > Auto Home, the PINDA ends up dead center in the circle. And I built this thing like 4 years ago. Its been sitting on the same shelf ever since. I'm not sure how it could get physically out of whack to have to start messing with the physical adjustments.

Why would Auto Home be correctly aligned, and the X Y and Z test pass. But then this happens during XYZ calibration? 

Posted : 20/09/2020 2:30 am
keri7240
(@keri7240)
Eminent Member

@chad-r7

Hi Chad

Oops, I meant to say you did the Z calibration, not the Mesh. Oh! and isn't the Z calibration meat to be done with the steel build plate in place? This of course would negate the sense points as they are not used for this. I see that you did the Z calibration with the plate off.  I think it matters.

The XYZ calibration is done with the plate off for the first part as the printer has to know the XY coordinates of the sense points, and the printer prompts to put the plate on before the Z calibration.

Changing the bed or the extruder alters the XY coordinates, so the XYZ should be done after a rebuild. You probably did this already after the 2.5 upgrade.

 

¡no entiendo Español!
Nein! Nicht Versteh!
Я немного говорю по-русски но не очень хорошо, и...
I'm not very good at English either! Maybe someday I'll find a language I'm good at?...
Posted : 20/09/2020 3:12 am
Karl Herbert
(@karl-herbert)
Famed Member
Posted by: @chad-r7

This is driving me bonkers. And on top of this, this forum keeps giving me some Word Fence 403 error every time I try to post his message!

One day, after many successful prints, the hot end crashes into the bed. I've been struggling ever since to get this thing working (literally a few months now), to no avail. 

  • I did a full factory reset
  • Flashed firmware 3.9.0
  • Self-Test passes
  • PINDA light goes off when near bed, so I assume that is not the issue?

What else can I do?

Did you flash the right FW? There's a difference between MK2.5 and MK2.5S?

https://help.prusa3d.com./en/article/check-axis-length-x-y-z-mk3-s_134223

 
This post was modified 1 month ago 2 times by Karl Herbert
Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 20/09/2020 3:57 am
Karl Herbert
(@karl-herbert)
Famed Member

Maybe a FW downgrade could help: https://github.com/prusa3d/Prusa-Firmware/issues/1830

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 20/09/2020 4:01 am
clemens.m
(@clemens-m)
Reputable Member

@chad-r7

Hallo,

looking on your hardware I would say your printer is still MK 2.5 (not MK 2.5S) - if so the firmware you have flashed is correct. I compared it with my printer. One question - have you done the complete wizard - so the complete self test and the part, where the pinda is going over the magnets in the heatbed in circles and other moves?

You go to "calibration" and then select wizard. This takes about 5 to 10 minutes to go through.

Give it a try, best regards, Clemens

 

Posted : 20/09/2020 2:18 pm
chad.r7
(@chad-r7)
Active Member

Yes, you are correct, it is a 2.5 not 2.5S.

I did do full Wizard 5 times, but for the video, I just jumped right to the XYZ Calibration for brevity.

The full Wizard jumps from the Self Test, which passes, to this XYZ Calibration. I think that part where it has the PINDA circle each point comes right after this part where it first tries to get to the right Z height so the PINDA can sense the circles? Which seems a little "Chicken and Egg"....if the PINDA needs to be over the circle, it should do that little dance around each circle first...but it needs to make sure it is close enough to the heat bed first.

 

Posted : 20/09/2020 3:00 pm
clemens.m
(@clemens-m)
Reputable Member

@chad-r7

Well - I have no idea how that could have happened. Normaly I would say it is not possible with a crash of the nozzle in the heatbed. But anyway. Lets try this:

To me it looks like that position of pinda in x-axis is ok and is inside the circle - problem is y-axis. How to solve this: The carrier of the heatbed, which is moving y-axis has a part which could be moved in y-direction. This part is where the belt is clamped  into it. So open both screws and if the printer is standing in normal position and you are in front of it (looking to LCD Display) this part should be moved in your position - 1 mm should be a first try. Then fix the screws and try again. You should now come more closer into the circle - if you are more far away - it is the oposite position (and I was thinking wrong) !!!

I now have to leave - give a response if that fixed your problem - I will have a look at tonight.

Best regards, Clemens

Posted : 20/09/2020 3:53 pm
chad.r7
(@chad-r7)
Active Member

@clemens-m

Thanks for the information. But this printer has been working fine for years. It has not been moved and as such it could not be out of physical alignment. Additionally, the Auto Home function results with the PINDA dead center in the circle. And further, with it just being off this much, isn't that what the XY calibration does, it circles the PINDA around the sensor points to correctly calibrate the XY planes to put the PINDA in the circle? 

Posted : 24/09/2020 3:39 am
clemens.m
(@clemens-m)
Reputable Member

So I have no other idea as others already mentioned: Try a factory reset, try to erase EEPROM and flash firmware - be sure using right version (2.5) and right board (two versions are available) - then Selftest and Wizard.

Sorry, Clemens

Posted : 25/09/2020 11:15 am
Karl Herbert
(@karl-herbert)
Famed Member

@chad-r7

take a look in here: https://help.prusa3d.com/en/article/misaligned-pinda-sensor-mk2-s_2016

The red LED lights up, but the sensor could still be defective and not switch correctly. I would replace the sensor after all unsuccessful attempts.

You may also want to contact the Prusachat.

good luck!

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 25/09/2020 11:41 am
joaquin.o
(@joaquin-o)
New Member

@chad-r7

This happened to me when PINDA was too low. Try with PINDA in an upper position. Be carefull the nozzle doesn't scratch the bed.

 

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Posted : 28/09/2020 9:20 pm
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