RE: Failed Y-calibration of a new CoreOne
I have the same "issue", but without Y calibration failed.
If the belt are at the same tension, there is a gap on the left side.
If there is no gap on both side, the belt have différent tension.
But in both case, Y axis pass the calibration test fine, and the prints i make to test have good quality.
I choose to go with the second way, no gap, différent tension. And wait for Prusa to make something.
RE: Failed Y-calibration of a new CoreOne
Yeah exactly. Left carries a 1-2 mm gap on the left and the right is making contact.
I've seen a few people in this thread attempting it. My logic is if there's a small misalignment, a small adjustment will fix it. That corrected centering combined with simultaneous belt tension seems to keep that gantry squared up.
My feeling is the brackets are either too weak or there's an asymmetrical load applied via the belt tension.
Possible fixes from Prusa could be machined aluminum parts for either the gantry brackets, idler mounts or both. Im wondering if the linear rail beam itself is too thin or requires more support and is the culprit for the flex.
RE: Failed Y-calibration of a new CoreOne
I've had the same issue and my gantry wasn't aligned properly (2-3mm gap on the right side), fixed it using MartinF's method. Then I tried to calibrate again several times and it still failed. After experimenting with calibration and belt tension for hours, I noticed that while the gantry was aligned untensioned, it was now "overcorrected" and there was a gap now on the other side. Bent the other side as well, tensioned the belts and had no gaps and now it did calibrate on the first try.
I also made another mistake, that maybe some others had as well. When tensioning the belts, make sure to move the Nextruder to the far center position (as it says in the belt tensioner app anyway) otherwise the belts will be overtightened (mine had 115 Hz when checked in the proper position)
RE:
Was fighting the same issue with my freshly built core on kit and was able to fix it…
made a (stupid) mistake while installing the pulleys to the X/Y motors and did not check it… so double check the pulleys on both sides and make sure the belts are centered!
after correcting this, tensioning the belts to 85hz on both sides, the calibration ran through on both axis.
before and after pics
RE: Failed Y-calibration of a new CoreOne
Hi,
I received today my brand new Prusa Core One, and I encountered the same problem. The printer was unable to perform the Y-Axis self test two times. The third test succeeds
I decided to exploit its "good mood", and try to print one of the test files. And succeed.
The Y-axis self test problem seems to disappears with the firmware update (6.0.2 to 6.3.2). But I will see with time.
RE: Failed Y-calibration of a new CoreOne
My X axis rail is perfectly in position. Belts are both on 85 Hz but I not able pass the Y and X test 🙁
I have my Core One as kit.
RE:
I finally received an answer today regarding return shipping and packaging. I'll put a screenshot here.
I'll also include the links.
CORE ONE ORIGINAL PACKAGING GUIDE
RE: Failed Y-calibration of a new CoreOne
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.
RE: Failed Y-calibration of a new CoreOne
They sent me the exact same packing instructions nearly a week ago.
Having previously been advised by support that they’d hopefully be able to provide the correct box, I replied to the email pointing out that by far the safest way to return the machine would be in the correct/bespoke packaging. Also, as the machine is faulty in my eyes, I asked why I should have to fund the cost of the box and packing materials.
They have yet to reply to this.
I finally received an answer today regarding return shipping and packaging. I'll put a screenshot here.
I'll also include the links.
CORE ONE ORIGINAL PACKAGING GUIDE
RE: Failed Y-calibration of a new CoreOne
Hi,
I have still the Y-Axis calibration issue. I tried a complete self-test, and the Y-Axis calibration failed. Moreover, it leads to a reboot, and an 31102 error.
Can Prusa support team find a way to solve this problem, which seems to be frequent ?? It's a brand new rather expensive printer, and it failed out of the box !!
Thanks
RE:
I had the same problem with my kit. After calibrating to 85Hz tension on both belts, the axes were not perfectly square (I had gap of 1 mm on X axis). I followed the instructions in the previous post - https://forum.prusa3d.com/forum/postid/738308/ and also contacted support to confirm that this was the correct solution. I was very careful and only used a minimum amount of force to bend with many repetitions. Finally, after a few hours of absolute frustration, I achieved a perfect result. My axes seems to be perfectly squared with tension around 85Hz (I always get +- 1Hz error) on both belts.
I have found that the easiest way to get good results is to square both axes with loose belts. Once I had both axes squared, I gradually (1/4 turn) increased the tension by the same amount on both screws. It is good to remember that you are increasing or decreasing the tension on both belts by adjusting just one screw, so you need to balance tension and squareness. If it starts to be uneven, you will need to loosen one side and tighten the other, ideally by the same amount.
I also recalibrated IS with the accelerometer after this procedure. I got almost same results as stock values. +- 1-2 hertz.
Im able to pass this test https://www.printables.com/model/1143218-vernier-skew-test
With this experience, it would be 10 minutes job next time :).
RE: Failed Y-calibration of a new CoreOne
I have still the Y-Axis calibration issue. I tried a complete self-test, and the Y-Axis calibration failed. Moreover, it leads to a reboot, and an 31102 error.
In my build, the Y axis self-test suddenly failed after I had removed and reinstalled the right side panel. Turned out that the cable to the side filament sensor had gotten stuck in its rear zip tie, and was bulging inward -- just far enough to cause significant friction on the Y linear bearing. After pushing the cable back through its zip tie and straightening it, the Y axis was back to normal.
An easy fix, but it took me a while to find the cause. It is well-hidden and seems so totally unrelated to the CoreXY mechanism...
RE: Failed Y-calibration of a new CoreOne
Hi,
My main concern with the current problems we have is that I know from experience that 3D printers tend to become less reliable over time.The Makergear M3-ID printer I have is 7 years old, and I use it about twice a week for lengthy printing.
I decided to buy a new one since it started having issues that never occurred before. Poor contacts in the extruder and hot-end connectors are mostly responsible for them.Their quality is decent, but the vibrations they encounter over time are deadly.
I am not prepared to keep a printer that exhibits problems that will be only partially solved from the beginning.
My two other issues:
- I can't use any USB key other than the Prusa one (I tried several good ones, without success, even if they are formatted by a PC).
- The door tends to slightly open itself as soon as I print with ABS.
RE: Failed Y-calibration of a new CoreOne
Hi again,
I resolved the issue with the USB key that was not recognized. Even if the error message says that I have to format the USB key in FAT32, the problem is not here. To be recognized, the USB key must be named 'PRUSA3D'. The error message is, at least, faulty.
It's perhaps a known "feature". As a former computer architecture lecturer, I believe that an operating system that recognizes insertion of a USB key must be capable of accepting different names for it.
RE: Failed Y-calibration of a new CoreOne
Interesting, but support seem to be giving conflicting advice.
From the transcript of my chat with them, for this same issue:
”We definitely do not recommend bending any parts.”
I had the same problem with my kit. After calibrating to 85Hz tension on both belts, the axes were not perfectly square (I had gap of 1 mm on X axis). I followed the instructions in the previous post - https://forum.prusa3d.com/forum/postid/738308/ and also contacted support to confirm that this was the correct solution. I was very careful and only used a minimum amount of force to bend with many repetitions. Finally, after a few hours of absolute frustration, I achieved a perfect result. My axes seems to be perfectly squared with tension around 85Hz (I always get +- 1Hz error) on both belts.
I have found that the easiest way to get good results is to square both axes with loose belts. Once I had both axes squared, I gradually (1/4 turn) increased the tension by the same amount on both screws. It is good to remember that you are increasing or decreasing the tension on both belts by adjusting just one screw, so you need to balance tension and squareness. If it starts to be uneven, you will need to loosen one side and tighten the other, ideally by the same amount.
I also recalibrated IS with the accelerometer after this procedure. I got almost same results as stock values. +- 1-2 hertz.
Im able to pass this test https://www.printables.com/model/1143218-vernier-skew-test
With this experience, it would be 10 minutes job next time :).
RE: Failed Y-calibration of a new CoreOne
Hi,
Given that I have the same problem and am waiting for the support team to contact me with a real solution, could you tell me how many people have already returned their printers for refunds? Thanks
RE: Failed Y-calibration of a new CoreOne
Hmm, I sent them the link to the forum and the youtube video and operator said that it is ok to do it.
Anyway, besides slight VFA I'm not experiencing any issues after this alignment. Personally, I don't think that this procedure can damage anything if it is done very gently.
Interesting, but support seem to be giving conflicting advice.
From the transcript of my chat with them, for this same issue:
”We definitely do not recommend bending any parts.”
RE:
They told me that.
Interesting, but support seem to be giving conflicting advice.
From the transcript of my chat with them, for this same issue:
”We definitely do not recommend bending any parts.”
RE: Failed Y-calibration of a new CoreOne
They told me what sounds rather silly to me, but I will try it.
3 step fix:
1. Loosen both belts to 60Hz or under (no need to be precise here)
2. Bring x axis to front and push it a bit so there is no gaps (in this step belts should auto align?!?)
3. Do tension on belts to 85Hz and try it out? Gap could be smaller but still there, if so, try and if it doesnt work contact again.
As said before I solved my issue with aluminum stripes, and its all working. Now they want me to remove it and try this 3 steps that sounds funny.
RE: Failed Y-calibration of a new CoreOne
After doing what they told me to do, i have no gap when the X axis is on the front, with or without tension on the pulley. When i put tension on the pulley, still no gap on both side.
I just have a very very little gap when the X axis is at the back, the right back touch before the left back, but it's very small.
I compare with my Bambulab P1S, she have no gap when X axis is on front, and she have a gap in the right back, bigger than on the Core One, but still very small.