XYZ Failure
I'm definitely at my wits end if I'm starting a thread asking for help. I started having 1st layer adhesion issues and yesterday I started to re run some of the calibrations. I started with Z cal, then belt tension, then XYZ cal. It failed at the last step. I don't know if it was because the back left is the issue or if it is set up to run through the whole test before providing the failure.
I went on line tried to search out solutions, there were some really good out of the box ideas however none of them pertained to me.
What have I done thus far? (I doubt this will be an all inclusive list because I did a lot of things.)
Checked the grub screws holding the gears on the X & Y steppers -> Tight
Ensured all the M3 screws that pertain to XYZ travel were tight -> Some needed to be snugged
Replaced the trapezoidal nuts on both Z stepper acme rods - > Old ones had play but the new ones did as well
Cleaned and repacked the X &Y linear bearings
I rotated all the bearings 180 degrees from its original position so that the load is applied to the other 2 bearing tracks
Inspected the 8mm hardened rods surface for groves and roundness -> Like new, I rolled them on a glass surface and their machine true
Inspected the hotplate for damage (particularly the spots where the embedded ferrous components under each dotted circle where the pinda sensor checks for alignment) -> No visual signs of wear
Tested the pinda sensor -> by placing a ferrous object within its field and observing the red light change as I moved it in and out of its range.
NOTE: During XYZ cal, I watched as the penda was searching for the spots, once it sensed the embedded metal (red light turning off), it shifted to the next step in its procedure. I was able to observe this in all 4 corners.
I adjusted the pinda sensor by lowering it closer to the bed -> this had no affect on the XYZ cal.
Things to consider
There is plenty of room around the printer to prevent full travel of the bed and its wiring harness, obstruction isn't an issue.
I recently updated the firmware to the latest, and the reason why I bring this up is because I decided to conduct the XYZ cal on my other mk3s+ and that one failed as well.
The back left corner of the hot bed is closer to the extruder than the other 3. However I don't have a way to measure exactly how much, if I had to guess it's over 1mm. I don't know the tolerances that the mesh bed leveling can handle and this is solely a blind eye observation.
Roughly 4-6 months ago I conducted this same test and both printers passed.
Conclusion
As I said I don't have a good way to test for squareness, suggestions are welcomed. Is there a way to check and see what exactly failed during the XYZ cal? I know this is a long post, as I want to be as thorough as possible.
From all my reading, there were a few asking for photos of the printer, I didn't see anyone specifically say what they wanted to see so here are a few pictures that I tool So here is a video to hopefully help. If you want to see something specific please let me know.
Thanks
Jimmy
RE: XYZ Failure
first of all go to firmware 3.11 as that is the one we all know works then please video the point of when it fails so just before and after it fails please
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RE: XYZ Failure
also are you using prusa link or octoprint etc
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RE: XYZ Failure
Is that a beta version? Excuse the ignorant question, I'm not by my computer see what's the most current... I almost thought for sure that what I had was current.
RE: XYZ Failure
no the most recent is 3.12
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RE: XYZ Failure
https://help.prusa3d.com/downloads/mk3s-2/firmware
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RE: XYZ Failure
you dont want the current one as there is many problems with that one its better to use the 3.11 version
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RE: XYZ Failure
once you get your problem solved you can go back to 3.12
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RE: XYZ Failure
I reverted back to 3.11 and ran the XYZ cal. It still failed.... Any other ideas???
RE: XYZ Failure
I new going to 3.11 wouldnt fix it it will just make it easier to trouble shoot please post video of point of failure
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RE: XYZ Failure
I'll make another video in the morning, what exactly are you wanting to see?
After point 4 (left rear) is done the lcd read out displays
"XYZ Calibration failed. Please consult the manual"
RE: XYZ Failure
Ah that sounds like a zip tie on the cable bundle is hitting the einsy case have a look if it hits when it's calabrting
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RE: XYZ Failure
When it homes it crashes into the 3d printed left Z rail support (like it should) there's no obstruction with the cable and einsy case.
But I like where your mind is. I didn't consider that, I'm running the xyz cal again with that sort of thing in mind.
RE: XYZ Failure
How are you making it do that movement also try doing a first layer calabration so it prints the lines and square I've got a feeling it could be the motor can you fil it like you did before but when it fails
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RE: XYZ Failure
I've exhausted the idea that there's obstruction in the xy range that prevents full travel.
I even adjusted the pinda closer to the bed. What's the likelihood that the pinda is failing?
I haven't started my day yet, but plan to film the xyz cal to the point where it fails.
I'll also run a 1st layer cal and film that as well.
RE: XYZ Failure
How are you making it do that movement
What movement are you referring?
If your talking about homing the x, I selected home and observed. Then when it was done I manually moved the extruder assembly left feeling for anything that may prevent it from touching where it should. The wires that attach to the hot end came extremely close, so I twisted that block slightly to provide more clearance. I'll admit that I didn't examine the y axis that closely.
RE: XYZ Failure
As I was making videos, I thought about moving the xy to the limits with the menu. Come to find out that the extruder crashes into the right side of the gantry 2mm shy of its full travel.
It got me thinking that changing m92 in the bios is the cause. I went back in and set x and y to 100, ran the xyz cal again and it made it through.
Something to add to the toolbox when troubleshooting.
I was reluctant to create specific mk3 printer profiles so that I can put the m92 code in the start gcode, but this is a good reason why that's the better choice even though I can foresee issues when saving gcode for the wrong printer profile.
It's probably too far fetched for the programmers to add a step in the xyz cal to reset the steps per mm to factory settings and then revert back to them after the calibration finishes.
Anyway @hello I appreciate all your help, it definitely allowed me to approach this problem from many different perspectives. Something that I wouldn't have thought of on my own.
Thanks!
RE: XYZ Failure
Your welcome 😃 glad you found the fix
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