RE: Failed Y-calibration of a new CoreOne
Mines really stabilised after the advice here - really appreciated.
I’m about 100-200 hrs of printing after the new firmware (strobing tightening method) and gantry bend; so far without it complaining at all about being out of alignment. (Multiple power cycles etc)
Generally it’ll now do a couple of homing movements at corner, then just do its thing.
One thing to note is I had to do a factory reset after the new firmware install to get it to stabilise with calibration using strobing method for tightening.
RE: Failed Y-calibration of a new CoreOne
I finished my assemble, except when doing the Y calibration test; it failed. I was informed to tighten the belt; I did just that to the point whereas the belt tore from the nextruder holder. I was surprised cause I tightened the screws well. How am I suppose to tighten, knowing there is a strong possibility that the belt tears off again ?
@Butters how did you tighten the screws? Are you turning the left and right screws by the same amount? If not you WILL bend the gantry to the point that Y calibration fails. I suspect that if you just blindly tighten you will get a severely bent gantry and I can imagine a scenario where the belt might get pulled out of the harness.
Also to @Jürgen's point, you have tendency to do "drive by" postings whereas we give advice and you never respond only to post again a month later on the same topic. So I'm assuming that you... finally... resolved your issue with the profiles?
RE: Failed Y-calibration of a new CoreOne
I have disassembled everything but now my left Y-belt has so much excess that I can't solve as to why compared to before.
RE:
I have disassembled everything but now my left Y-belt has so much excess that I can't solve as to why compared to before.
So you have removed the Nextruder and have access to its carrier plate, right? Are all four belt ends pulled through the slits to form that self-locking loop, with approx. 5 teeth sticking out on each free end?
See the photos in the assembly guide, here and here. Maybe you could share a photo how your carrier plate looks? Your initial report that the belts slipped out when tensioned has me wondering whether you might be installing them incorrectly.
Also, if you suddenly have extra belt length compared to your initial build: Is the belt still routed correctly around all the idler wheels, the tensioner and the motor pulley?
RE: Failed Y-calibration of a new CoreOne
I don't know what went wrong; the Y-belt is the issue; X is fine. The belt loop doesn't seem out of place but there is so much excess belt after disassembling.
RE: Failed Y-calibration of a new CoreOne
I don't know what went wrong; the Y-belt is the issue; X is fine. The belt loop doesn't seem out of place but there is so much excess belt after disassembling.
Can you take a photo? Obviously the belt is not routed correctly.
RE:
Hello, I have started to get this same problem on my Core One, it appeared out of the blue from one print to the next.
It refused to calibrate the y-axis, but after trying re-tensioning the belts (and that not working) I looked and found this thread.
Updating the firmware to the 6.4 release candidate (6.4.0-RC) fixed the Y-axis calibration issue immediately, BUT the precise homing calibration test fails instead.
After the FW update I redid the belt tensions again with the new built-in system, made sure there is no play in the gantry. Neither fixed the homing calibration.
I also did factory reset both before and after I updated the firmware.
So my questions are; Does it matter that there is "play" in the sides of the gantry when the belts are loose, if there is NO play in the gantry and its fully aligned (as per this article) when belts are tensioned?
I have tried to bend it into alignment while the belts are loose, but it wont budge unless i but my weight into it, which seems excessive to me, based on everyone saying to use light pressure.
Secondly I have not been able to find anyone else mentioning it (full disclosure I haven't read this ENTIRE thread yet) but my Y-axis values goes to -19 rather than 0, is this normal?
I'm very suspicious of this since neither the X- or Z-axis goes into the negatives.
Please let me know if I have overlooked any other suggestions, I'm super confused by how the printer could work perfectly during one print and then 2 days + 1 power cycle later it's completely f*cked.
RE: Failed Y-calibration of a new CoreOne
There is a new support page which describes gantry adjustment and belt tensioning (using the 6.4.0 RC firmware) in the Core One: https://help.prusa3d.com/article/adjusting-belt-tension-core-one-l-core-one_845048
The new instructions put a lot of emphasis on tightening the belts symmetrically (moving both belt tensiones alternately by equal amounts). That way you cannot introduce a gantry skew while tightening the belts -- but it should also not be possible to "fix" a skewed gantry by asymmetrically tightening the belts. The gantry needs to be straight in the beginning, with loose belts, and the instructions start with that step.
I think it is worth working through that procedure once more.
RE: Failed Y-calibration of a new CoreOne
I'm trying to reassemble but I'm fighting with the nextruder holder tendentiously. One belt in, one belt out; one belt in, one belt out. Then when a belt is in, for example the Y axis it's extremely loose.
RE: Failed Y-calibration of a new CoreOne
Wrong word used in previous reply; edit seems to be failing at this point.
RE: Failed Y-calibration of a new CoreOne
I'm trying to reassemble but I'm fighting with the nextruder holder tendentiously. One belt in, one belt out; one belt in, one belt out. Then when a belt is in, for example the Y axis it's extremely loose.
So are you saying, when you insert the belt into the harness which is mounted to the linear rail, the belt does not hold and slips out? Unless you take some photos of your setup, I'm not really sure how we can help.
RE: Failed Y-calibration of a new CoreOne
It really sounds like you are still misinterpreting the assembly instructions and not forming the belt loops as intended. They should stay in place quite well even before you mount the Nextruder again, due to the interlocking teeth.
As @hyiger wrote -- please post some photos of your assembly!
RE: Failed Y-calibration of a new CoreOne
I just tried the new belt tightening wizard of 6.4.0-RC. Wow, this integrated belt responator is far easier than the phone app. I wasn't sure what to expect for the resonant excitation. But it was quite and as I turned the upper adjustment screw, blink-blink I found the resonance within about 15 seconds. Did the lower belt, then back to check upper & lower. Spot on at 95.5Hz and 92Hz. Thanks Prusa...we needed this a year ago!
RE: Failed Y-calibration of a new CoreOne
I found a tachometer app for Android but I don't know how to measure the Hertz within the App; https://play.google.com/store/apps/details?id=zsmapps.rpm.meter.tachometer.flashlight&hl=en-US ?
RE: Failed Y-calibration of a new CoreOne
I found a tachometer app for Android but I don't know how to measure the Hertz within the App; https://play.google.com/store/apps/details?id=zsmapps.rpm.meter.tachometer.flashlight&hl=en-US ?
Install the 6.4.0-RC firmware, use the belt tensioning wizard. It’s better.
RE: Failed Y-calibration of a new CoreOne
My calibration isn't even complete so before I install any firmware update; I want to know how to make sense of this app ?
I found a tachometer app for Android but I don't know how to measure the Hertz within the App; https://play.google.com/store/apps/details?id=zsmapps.rpm.meter.tachometer.flashlight&hl=en-US ?
Install the 6.4.0-RC firmware, use the belt tensioning wizard. It’s better.
RE: Failed Y-calibration of a new CoreOne
My calibration isn't even complete so before I install any firmware update; I want to know how to make sense of this app ?
The point is that the 6.4.0 firmware will make it easier for you to obtain proper adjustment and calibration. And on the other hand, a completed calibration is not required in order to install the firmware. So I am not sure what you are concerned about?
I don't know what the software you downloaded is meant do do and how to operate it. It looks like a flashlight tuner (stroboscope) for use with cars. Just the stroboscope alone will not help you with your printer, because you also need something to excite vibrations in the belts in a controlled way. Which is what the belt tuning wizard in the 6.4.0 firmware does. Do yourself (and us) a favor and install it.
Unless I overlooked something, you never showed us photos of how you mounted the belt ends in the Nextruder. Have you taken some, and could you share these please?
RE: Failed Y-calibration of a new CoreOne
In the comments on this page one mentions they used an iOS app to measure the Hertz of the belt; therefore I found similar. I understand about the firmware update; although what I want to do is simply understand how to use such an app to measure the Hertz.
RE: Failed Y-calibration of a new CoreOne
In the comments on this page one mentions they used an iOS app to measure the Hertz of the belt; therefore I found similar. I understand about the firmware update; although what I want to do is simply understand how to use such an app to measure the Hertz.
The page you linked is for the XL printer and not a Core One and the app in question is Prusa's own app for measuring belt frequency that also works for a Core One. Not sure why you are making this more difficult than necessary. Just install the 6.4.0-RC firmware and run the manual belt adjustment wizard if you are having an issue with Prusa's belt tuning app.
You refuse to take images of your setup when asked and ignore the advice we give. So I have to ask, do you even own a Core One printer?
RE: Failed Y-calibration of a new CoreOne
I want do the belt measuring as before the 6.4.0-RC firmware update. As many had to do.