Calibration Problems on Kit Build
I recently bought and assembled the i3 MK2 kit. I was careful and measured all the distances as I was putting the Y carriage together (and throughout the rest of it), but ever since I got the build finished and started using it, I've had various-but-inconsistent problems that point to the chassis being out of alignment somehow.
I've run "calibrate XYZ" several times, and sometimes it reports "severely skewed" but (after adjustments to the M10 nuts) other times it reports "slightly skewed" or even the "in alignment-congratulations" message (which is what happened most recently).
The other clue is that, during the pre-print calibration process, the printer head touches on the 9th PINDA probe, enough so that it flexes the print bed a little bit. Not the others, mind you, just that one. It seems to do that when it's supposedly "aligned" as well as when it's "severely skewed."
I've checked and double checked everything down below in the chassis, using digital calipers to ensure consistent distances between key points, but clearly something is not perfect. Any pointers on what to check out? I don't want to tear the whole thing down and rebuild, but if I can't figure it out that may be next.
- RBW
Re: Calibration Problems on Kit Build
Hi Robert
First try lowering the probe by about 0.5mm and then try the calibration again.
Also ensure that all 4 feet are flat on the work surface.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Calibration Problems on Kit Build
Interesting, that seems to have helped a bunch. I had lowered the probe a couple of times already, and I had read that it should be 1-2 mm behind the extruder nozzle. It was probably about 1mm. But I skooched it down a bit and the calibration succeeded, told me "aligned--congratulations", and the V2 Calibration routine allowed me to adjust the Z height and I'm off and printing.
I'm still curious how that fixed the problem (after your suggestion that's the ONLY thing I changed) and why just the one corner was seemingly too high. I was convinced there was something warped or loose or something that had to be causing it. But that appears not to be the case.
If you have any insight as to what was the underlying issue, I'd be grateful to hear it. Either way, I'm grateful for your suggestion, Peter, as it seems to have been the (last remaining, anyway) issue.
Best Regards,
- Robert
Re: Calibration Problems on Kit Build
it's possible that the one corner is a little out of position and the inductive sensor was unable to reliably sense it from the higher position.
tke pads to be sensed, are not very large targets.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Calibration Problems on Kit Build
Fair enough. I guess small adjustments can make a big difference--good to keep in mind.
Thanks again for the reply. Glad to be past the build and into learning my new machine's capabilities!
Best,
- Robert