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Failed Y-calibration of a new CoreOne  

Stránka 10 / 13
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BigScotAl
(@bigscotal)
Eminent Member
RE: Failed Y-calibration of a new CoreOne

This is my concern. It feels like those that are managing to get the printer passing the calibration tests just now are only just managing to do so  

I’ll be interested to see some updates in a few weeks/months regarding whether the machines are still passing calibration, or after some use they revert back to failing again.

Posted by: @henri-2

I am not prepared to keep a printer that exhibits problems that will be only partially solved from the beginning.

 

Napsal : 24/04/2025 9:37 am
Chris
(@chris-68)
Active Member
RE: Failed Y-calibration of a new CoreOne

 

Posted by: @fheusel

I received an identical email yesterday (my Core One has a skewed print bed with a total deviation of 2.8mm).
I find it completely unacceptable that I shall now improvise a packaging for a printer weighing 23 kg, when there are many reports of transport damage even with the original packaging.
I have therefore replied to the e-mail that I insist that they send me suitable packaging material, but have not yet received a reply.

And that's exactly the kind of sh** I'm not in the mood for. I have now taken my printer completely apart. Even if not everything in individual parts. I left the hotend and other assembled parts as they were. But otherwise housing, struts, motors, as good as possible again packed in origin. Screws all together in a bag. This eternal writing back and forth is just annoying. But even more annoying is the waiting time until you get an answer. I guess they are overloaded. Anyway, the parcel is now ready for collection. I really hope that they will at least order a pick-up and not have the printer hauled to the mail order company.

Oh yes, I took a photo of each box as I packed everything together, put all the pictures in a PDF and sent it to them.

Surprisingly, it all somehow fitted in again

Napsal : 24/04/2025 10:24 am
BigScotAl se líbí
FoxRun3D
(@foxrun3d)
Illustrious Member
RE: Failed Y-calibration of a new CoreOne

To be recognized, the USB key must be named 'PRUSA3D'. The error message is, at least, faulty.

Curious… My USB sticks are all named after the printer they're on (in my case Red, Yellow, Blue, etc). Never noticed this being an issue,

Formerly known on this forum as @fuchsr -- https://foxrun3d.com/

Napsal : 24/04/2025 11:20 am
Rainer se líbí
BigScotAl
(@bigscotal)
Eminent Member
RE: Failed Y-calibration of a new CoreOne

I am basically in the same situation. They have asked if I would source a suitable box/packaging myself, and said that they would provide a £25 Prusa store voucher by way of recompense.

I have stated, yet again, that I don't know where to locate a suitably large/strong box that would be suitable. I have suggested they just keep their £25 voucher and use the value of it to send me out the correct box instead.

Awaiting the next response.....

Posted by: @fheusel

I received an identical email yesterday (my Core One has a skewed print bed with a total deviation of 2.8mm).
I find it completely unacceptable that I shall now improvise a packaging for a printer weighing 23 kg, when there are many reports of transport damage even with the original packaging.
I have therefore replied to the e-mail that I insist that they send me suitable packaging material, but have not yet received a reply.

 

Napsal : 24/04/2025 12:09 pm
Kova
 Kova
(@kova)
Active Member
RE: Failed Y-calibration of a new CoreOne

This is what I got as an answer:

"1 . Please lower the belt tension of both belts, aiming for ~60Hz or lower frequency. No need to be precise but at this stage, it is important to loosen both belts quite a lot.

 

2 . Now grasp the two ends of the gantry (X axis) and pull them all the way against the front corners, like in the picture here below.

Because the belts are so loose now, this action should allow partial belt shifting and position auto-adjustment.

(Here is image of x axis completely to the front and showing both sides, on the images there are no gaps)

3 . Now you can tighten the belts again and aim for about 85Hz on both belts.

Once done, please grasp and pull the two X-ends again all the way against the front corners as per the picture above, and take a new picture of the gap between X-ends and corner pieces (if there still is any)."

 

How is this solution??

Napsal : 24/04/2025 2:06 pm
Nick
 Nick
(@nick-27)
Member
RE: Failed Y-calibration of a new CoreOne

Hello all,

I have the same x/y axis calibration failure, however, the x gantry is square with the stops and I can achieve a perfect 85hz on both sides. I’ve been through this entire post and tried everything that was suggested with the exception of bending and shimming as it’s not necessary. No obstructions for the y-axis. 

Aside from doing everything that was suggested already, I also performed a few hard resets to clear any memory that may be lingering to no avail. 

Any and all suggestions are welcome. I reached out to support via email as chat isn’t available right now. 

Napsal : 28/04/2025 7:11 am
BigScotAl se líbí
Nick
 Nick
(@nick-27)
Member
RE: Failed Y-calibration of a new CoreOne
  1. Second image wouldn’t add. 
Napsal : 28/04/2025 7:13 am
Chris Hill
(@chris-hill)
Reputable Member
RE: Failed Y-calibration of a new CoreOne

Does the gantry touch/rub on any cables or cable ties? I believe the cable from the side filament sensor is a potential culprit. 

Napsal : 28/04/2025 7:18 am
BigScotAl
(@bigscotal)
Eminent Member
RE: Failed Y-calibration of a new CoreOne

I’m still waiting to return mine.

I looked at it yesterday, and thought “I’ll maybe have just one more go at getting it to work”

Then I decided to preserve my sanity and left it alone. 🙂

Napsal : 28/04/2025 7:28 am
Nick
 Nick
(@nick-27)
Member
RE: Failed Y-calibration of a new CoreOne

Nope, it’s clear. 

Napsal : 28/04/2025 7:37 am
altaic
(@altaic)
Trusted Member
RE: Failed Y-calibration of a new CoreOne
Posted by: @nick-27

Hello all,

I have the same x/y axis calibration failure, however, the x gantry is square with the stops and I can achieve a perfect 85hz on both sides. I’ve been through this entire post and tried everything that was suggested with the exception of bending and shimming as it’s not necessary. No obstructions for the y-axis. 

Aside from doing everything that was suggested already, I also performed a few hard resets to clear any memory that may be lingering to no avail. 

Any and all suggestions are welcome. I reached out to support via email as chat isn’t available right now. 

The gantry can temporarily square up when it's driven into the front stops, when in reality it's out of square in a metastable state, and will shift around and cause these sorts of errors. You should disable the motors, loosen the belts completely, and then check for squareness by moving the gantry to the front by hand. You can also move the gantry to the back stops and observe spacing on the opposite side.

Another thing I noticed with the gantry being out of square is that the print head will jump left or right (x-axis movement) if you drive the gantry (with the belts properly tensioned) along the y-axis into the back stops, and then into the front stops. This is an example of the instability/metastability I described above.

Napsal : 28/04/2025 7:46 am
Nick
 Nick
(@nick-27)
Member
RE: Failed Y-calibration of a new CoreOne

I appreciate the reply. Please see the attached video I just took. It seems there is no drift on the x-axis, and there is less than a 1mm gap on the rear left stop. 

Napsal : 28/04/2025 8:03 am
Nick
 Nick
(@nick-27)
Member
RE: Failed Y-calibration of a new CoreOne

I’m just as bad at this forum thing as I am troubleshooting. 

https://www.dropbox.com/scl/fi/ls8g7g5wot1v66luzxj9r/IMG_0345.mov?rlkey=ux2n4wean96z0jtqhl2o7061h&st=fl9yuqjg&dl=0

Napsal : 28/04/2025 8:06 am
Roland B-S
(@roland-b-s)
Member
RE: Failed Y-calibration of a new CoreOne

Unfortunately I have the same issue as the other users in this thread. I´ve tried all the ideas I've found in this thread, none of them work. Even when I managed to close the gap to less than 1mm, it still fails the calibration. Support is not responding. Chat is not working. As others already mentioned, I am not willing to invest endless time to fix an immature design. I am already preparing to send the printer back, if there is no useful reply in the next days.

Very disappointed, I thought Prusa had a good reptutation.

Anyhow, If somebody has a good idea to try or feedback regarding the return process, I would be happy to learn about my opportunities . 

Napsal : 28/04/2025 1:55 pm
BigScotAl se líbí
Chris
(@chris-68)
Active Member
RE: Failed Y-calibration of a new CoreOne

Today I finally received the return shipment information. Pickup via DPD, link was sent.

Napsal : 28/04/2025 5:22 pm
lancer enkor
(@lancer-enkor)
Active Member
RE: Failed Y-calibration of a new CoreOne

Try it with completely loosened belts.

Posted by: @nick-27

I’m just as bad at this forum thing as I am troubleshooting. 

https://www.dropbox.com/scl/fi/ls8g7g5wot1v66luzxj9r/IMG_0345.mov?rlkey=ux2n4wean96z0jtqhl2o7061h&st=fl9yuqjg&dl=0

 

Napsal : 29/04/2025 7:27 am
Nick
 Nick
(@nick-27)
Member
RE: Failed Y-calibration of a new CoreOne

Before I point blame at Prusa, I’m going to approach this differently and assume that it was user-error that caused this; at least in my case. I’m going to disassemble the gantry entirely and then reassemble verifying square on all assemblies and parts. 

What would help, and it’s something I think Prusa should provide, are torque specs for everything gantry related. 

One thing of note, while some people are finding their linear holders aren’t bent at a perfect 90° angle, proper torque could possibly straighten these during installation. 

I’ll keep you updated as to my progress with pictures if I remember. 

Napsal : 29/04/2025 8:56 am
Chris se líbí
Biomech
(@biomech)
Estimable Member
RE: Failed Y-calibration of a new CoreOne

As mentioned in other thread, try to put Core One on the solid floor. Seems like if you have printer on not sturdy enough base, it may affect calibration.

Napsal : 29/04/2025 11:05 am
Kova
 Kova
(@kova)
Active Member
RE:

OMG guys....

Not sure what is going on. Long story short.

Forum solution: I put little aluminum plates under brackets, that solved calibration and printer worked. I was out few days, and tried to print Today, failed with error: collision detected (same Y axis problem), checked Y axis it was spot on, no gaps ??!

2nd solution: I decided to listen to the support to remove plates under brackets. All I did when screwing back brackets is holding y axis in position, and voila, y axis sits without gaps. Calibration passed, and now printing, not sure how long this solution will last. I didn't re-check belt tension either. Will edit post and let you know how print turned out. 

    

This post was modified před 2 weeks by Kova
Napsal : 29/04/2025 2:26 pm
Kova
 Kova
(@kova)
Active Member
RE: Failed Y-calibration of a new CoreOne

Sorry to spam forum, I would edit post, but time to edit passed. 
Scratch last post, not working. It started all good, but like something changed and it started to mess printing, so I stopped it. Tried to re-print and it didn't pass calibration again. Checked belt tension 87 / 93, tried to get it to 85 / 85, gap is still there.

Tried to do as support said: put belts to around 60 or under, bring axis to the front and check gap (should be smaller they said), I can't see any change 3-4mm as before. Their next step is to make tension 85 / 85 now but I do not see point in doing so as gap remained huge. 

Napsal : 29/04/2025 2:51 pm
Stránka 10 / 13
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