Constantly recalibrating
My core one recalibrates home before every single print for almost 5 minutes. Is anyone else having this issue?
RE: Constantly recalibrating
There's a post from @dawson in a neighboring thread here, which describes the same issue I think: https://forum.prusa3d.com/forum/postid/735762/
Tightening the belts seems to have fixed this for him.
Posted by: @dawson
I would like to know how to adjust the belts as well, I got my core one yesterday and every time I turn it on and try to start a print it wants to recalibrate home and just sits in the front right corner wacking the sides over and over for 5 to 10 minutes with repeated errors about homeing and calibration and print head collisions but doesn't ask me to do anything. It eventually seems to give up trying to calibrate home and just goes ahead and starts the print.
I read that could be due to loose belts? I'm coming from a mk3s and a mk4 so this is my first core xy machine.
Ok, There are two holes in the front with adjustment screws for the belt tension, I tightened each one up by about 1 and a half turns, ran a homing calibration which it did quickly this time and started a print with no issue so hopefully that fixed this problem.
RE: Constantly recalibrating
I didn't see that, I was going to try that next. I figured it would be tightened properly from factory but I guess not. Thanks!
RE: Constantly recalibrating
I am in the same boat. Often it fails when try to home the printer. Do we have any frequency value which we should aim for?
RE: Constantly recalibrating
Do we have any frequency value which we should aim for?
I don't think Prusa has published anything specific to the Core One yet. @dawson did it by feel apparently. The values for the XL should be in the ballpark, I'd assume: Follow the same procedure, maybe add 20% to the target frequency to account for the shorter belts?
https://help.prusa3d.com/article/adjusting-belt-tension-xl_401793
No warranties -- maybe checking with Prusa support first is the better idea...
RE: Constantly recalibrating
Its a known bug in tthe FW.
RE: Constantly recalibrating
Prusa app was just updated for core one belt tension so I'll try and go by that
RE: Constantly recalibrating
Sadly according to this issue its not pretty high on the list. But it should be as i know more than 3 people suffering from this. (even in some livestreams)
https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4185
Its a known bug in tthe FW.
RE: Constantly recalibrating
Not sure whether that's the same issue. It describes that unnecessary calibrations are performed, once before the first print after each power-up -- but not that those calibrations take 5 minutes because the printer keeps retrying?
Sadly according to this issue its not pretty high on the list. But it should be as i know more than 3 people suffering from this. (even in some livestreams)
https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4185
Its a known bug in tthe FW.
RE: Constantly recalibrating
Its the same.
Not sure whether that's the same issue. It describes that unnecessary calibrations are performed, once before the first print after each power-up -- but not that those calibrations take 5 minutes because the printer keeps retrying?
Sadly according to this issue its not pretty high on the list. But it should be as i know more than 3 people suffering from this. (even in some livestreams)
https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4185
Its a known bug in tthe FW.
RE: Constantly recalibrating
You are not a man of many words. 😉
How do you know? I did not see any reference to the "constantly retrying" scenario, and why that would be avoided by tensioning the belts.
Its the same.
RE: Constantly recalibrating
It shouldn't. The fact that he sometimes homed so often is something that many Youtubers often mention in their reviews. It has already been confirmed that this is a SW problem. There are probably some values in the FW that are set too sensitively or something similar. It's the same for me and my belt tension is a perfect 82Hz on both sides. So it has nothing to do with that.
RE: Constantly recalibrating
The phenomenon is quite varied. For me it sometimes takes 3-5 attempts and sometimes only one until it works. But I've also had it take a very long time and I thought it would never stop.
Not sure whether that's the same issue. It describes that unnecessary calibrations are performed, once before the first print after each power-up -- but not that those calibrations take 5 minutes because the printer keeps retrying?
Sadly according to this issue its not pretty high on the list. But it should be as i know more than 3 people suffering from this. (even in some livestreams)
https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4185
Its a known bug in tthe FW.
RE: Constantly recalibrating
Hello
l have this problem too, spoke with the help team and while waiting for a response I did a factory reset, since same problem. They asked for a video and then said this was “normal” after reading this article l think l will try belt adjustment, also the nozzle has put a slight chip in the plates coating where it starts its probing procedure? Apart from this highly delighted
Cheers
RE: Constantly recalibrating
Mine is doing it. Longest I had was 7.5 minutes of banging it's print head in the front left corner. Very annoying.
RE: Constantly recalibrating
I didn't see that, I was going to try that next. I figured it would be tightened properly from factory but I guess not. Thanks!
I don't know if that is a good assumption to make. Any mechanical adjustment mechanism should be considered suspect after going through the shipping system. Just the normal vibrations from the different phases of shipping can loosen fasteners, especially ones that aren't torqued (like adjustment screws).
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs
RE: Constantly recalibrating
I don't know if that is a good assumption to make. Any mechanical adjustment mechanism should be considered suspect after going through the shipping system. Just the normal vibrations from the different phases of shipping can loosen fasteners, especially ones that aren't torqued (like adjustment screws).
I don't think I agree on that. It is certainly a reasonable assumption to make that all necessary factory alignments shall still be correct when the product arrives at the customer. If that were often not the case, the manufacturer got either the design, or the production process, or the packaging wrong.
What I find more interesting in the present case though: Has tightening the belts (to the 85 Hz resonance now recommended in the Prusa App) fixed the repeated homing problem for all affected units? @dawson wrote that it did for him; @Cloud1983 suggested that it's a firmware issue (and hence not directly related to belt tension?). What did others find?
RE: Constantly recalibrating
For me it's interesting to see that in the firmware for the XL the tolerance is 0.15mm but for the Core One it is 0.075mm. seems like overkill to have it that exact or?
RE: Constantly recalibrating
I noticed it tends to do it much more if you preheat the printer. Starting a print cold it usually doesn't bump more than a few times but if you preheat for let's say 20 minutes it'll bump for 5+ minutes
RE: Constantly recalibrating
The phenomenon is quite varied. For me it sometimes takes 3-5 attempts and sometimes only one until it works. But I've also had it take a very long time and I thought it would never stop.
Not sure whether that's the same issue. It describes that unnecessary calibrations are performed, once before the first print after each power-up -- but not that those calibrations take 5 minutes because the printer keeps retrying?
Sadly according to this issue its not pretty high on the list. But it should be as i know more than 3 people suffering from this. (even in some livestreams)
https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4185
Its a known bug in tthe FW.
This stupid bug has been around since the MK4