Front Z steppers, 1-2mm of missaling, impossible to recover
Yesterday arrived my factory assembled core one.
And I noticed the bed it's tilted, even if force the Z steppers to ram against the base in calibration menu I can't get rid of these misalign.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
Did you try moving the print bed to the bottom, disabling the motors (or turning the power off), and turning each z-axis lead screw so the print bed blocks touch the z-axis mounts on the bottom?
Those three z-axis mounts are the reference points for the print bed. Then when you power back up, the stepper motors will keep the print bed aligned with that reference plane while they’re active. If you move the print bed while the stepper motors aren’t holding position, the reference is lost and the bed won’t be square to the x and y axes.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
Yes. Tried these.
Finally I put a 1mm spacer on right Z stepper, run the Z align again and now I got my bed squared to the gantry.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
Ruler squared with bed/side panel, now I have the same distance to the gantry, before that I had 1mm of diference.
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Try lubricating the lead screws then re-home the z. This has fixed the issues for others.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
If the gantry is not parallel to the floor of the building chamber where the z-axis motors are mounted, you could try loosening the gantry frame and the four vertical corner pieces, readjusting them, and tightening it back up. I’m surprised that it would be off be that much, though. Anyway, you can see how those pieces go together in the Core One kit assembly instructions.
Ruler squared with bed/side panel, now I have the same distance to the gantry, before that I had 1mm of diference.
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i got the same problem, but my left side is hanging down, may you be so kind sharing pictures of your solution, please? 🙂
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
The better way to measure this would be to measure the distance the nozzle is from the bed and move it around the 4 corners measuring at each corner.
You could attach a dial indicator to the print head. After taking your measurements you could then print some permanent spacers to attach to the z motors. Then even if you rerun the z axis homing it'll still be correct.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
Just received an assembled Core One and noticed this as well. I was printing a box about 160mm x 160mm and noticed the Z lead screws turning quite a lot during long print head travels. Thought I was seeing things for a minute, but I later confirmed that there's quite a discrepancy between the XY gantry and the bed. As in, 1~2mm between front and back, mostly. Did all the calibrations and homing, etc. Still WAY off, in my opinion.
I was able to correct some of this by loosening the XY gantry screws (2 in each corner, all accessible from the outside of the frame, with door open) and moving the corners of the XY gantry up or down as much possible, as needed, and then re-tightened. There's only so much room in the bolt hole of the frame, so there's not much room here, but some.
After some more poking around - this seems to be parallelism issue between the bottom plate (where Z motors are mounted) and the XY gantry. How these two planes get bolted/assembled to the frame, will ultimately decide how parallel these two planes end up to each other. I might go after the Z plate to frame screws to see if there's some further wiggle room or adjustment here, but I hate tearing into a brand new, fully assembled printer.
I'll be upgrading my MK4S (if and when kits ever ship), so I'm sure I'll have a much better understanding of where and how things screw together. Knowing what I know now though, it will help with the upgrade build process to see if there's opportunity to better align these two planes from the start.
I'm definitely not used to seeing so much Z lead screw movement (and it mechanically makes me a bit cringy inside, lol)...BUT the printer seems to print great! I'm really liking the new features of the Core One.
Looking forward to what the various adjustments might turn out to be for this issue or shall I say, observation? 🙂
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
I am also having this issue, and I noticed that there is some vertical play (about 1.5mm) on both the left and rear threaded rods, but none on the right. All lead screws are allowing a small amount of horizontal leeway as recommended. It had led to some ugly ABS prints. Tried everything here except for the spacer trick, which I'll attempt later. Need to get it fixed and I have a print order to begin soon.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
Hello.
The missaling doesn't affect to the printing dimensions/skew.
Checked twice.
The firmware compensate this but it's uggly to see the Z steepers up/down when printing larger objects.
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Same here, doesn't affect the print quality, firmware do the job, but i don't know why there is this 1.5mm différences. I check all the build, but don't find what make this happen. I try to aligne all the stepper when the bed is in the bottom, but after homing, the gap come back
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
You need to put a spacer on the screws of the base.
Measure what steeper it's more far and put a 1mm spacer and rerun the Z calibration.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
Where exactly you put the spacer ?
and this solve the "problem", but don't answer why there is a différence between the two side, all seem to be identical on both side.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
You need to put the spacer between the printed piece that holds the trapezoidal nut and the screws of the below plate.
why happens this? IDK , bad QA, bad design, etc... I'm only a guy that had a some core ones. Some assembled, some from kit, both types has this problem.
Where exactly you put the spacer ?
and this solve the "problem", but don't answer why there is a différence between the two side, all seem to be identical on both side.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
So here ?
Thank you for help. I continue to search where the problem who make this différence is.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
Yes, I would print some u shaped spacers the correct thickness and put them there. I'm kinda surprised there is no way to adjust this. If the bed is not square to the X/Y assembly no amount of software compensation can fix it. It could make a successful print, but the bottom of your part will not be square to the bottom.
Another way to check squareness of the bed to the xy would be to move the bed to the top, then manually move the head to the 4 corners and center and using a piece of paper, check clearance between the nozzle and the bed.
Even better would be to use feeler gauges to measure the distance and then you would know how thick to make your spacers.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
I'll add that if you want to get really precise, do this with the bed heated to the temp you most often use. The bed moves when it heats up.
RE: Front Z steppers, 1-2mm of missaling, impossible to recover
So here ?
Thank you for help. I continue to search where the problem who make this différence is.