I was just wondering, did you manage to solve the issue?
Thanks for that link to the Reddit page. I’ve been having the same issue on the P1S. After hours of trying to figure this out over the last few months, I finally found the issue today after finding this post, checking out the Reddit post you linked, and taking another look for obstructions. The aftermarket filament guide that I printed for the top of the print head had come loose enough to stick up just enough to obstruct the movement in at least one of the corners, shifting the X-Y axis. So today, I printed my first successful multicolor print in months! Thanks again!
I too was driving crazy about this same problem. In my case, after a nuzzle change I left one unscrewed, so everything wobbled. Now everything’s back to normal.
Ive also got the same problems. scratched print bed and layer shifts. Got the ams for Christmas from the wife and nothing but problems on color change.
Im gonna take these dust covers off and retighten the belts and calibrate. see if this fixes my issues.
Yea, take off all mods. I had a filament guide on the toolhead that was fine for a long time but then, all of the sudden I was getting shifts on color changes. The toolhead wasn’t moving all the way to the left when cutting the filament. The filament would cut but it would slightly offset the next layer.
Take it all off then do all the maintenance and calibration. hope you sort it out.
I had this exact same issue on a fairly new printer. It started after I forgot to put a build plate in and I clogged up the nozzle and knocked the print head cover off. For all prints afterwards, it would scratch the build plate during the nozzle cleaning period. If I was printing in a single color, I would get an error message that the print head cover came off at the very end of the print. It was always securely attached. I could reach in and pop it off and on and the print would complete successfully. If I was printing multiple colors with AMS it would give me the print head error on color change. If you popped the head off and on, it would continue but you got a layer shift.
Multiple factory resets and re-calibrations did nothing to fix it.
After watching many prints, I caught what was causing the layer shift and print head error. At the finish of a print, or at a color change, it would move the print head to the front left corner (as you face the box) to cut the filament. Something was off here and I would hear it grind the gears and try to move the head too far into the corner. This was causing the head to pop off slightly. I verified this on several small test prints. Happened every time.
In the meantime, I had ordered the anti-vibration feet. Once those arrived, I shut everything down and installed them. In the process the machine was turned on it’s back and side a couple of times. Once I got things put back together, the error completely disappeared and has been printing successfully for several days.
I am not sure of what exactly fixed it, other than I bumped it just right. So I guess it was percussive maintenance. But either way, look for the symptoms I described and I bet you will find it is either striking something when it goes to cut the filament, or it is banging the head into that corner. You might try just shutting things down and physically moving the printer around a bit and see if you can jar whatever was causing the issue loose.
This is what clued me into the problem: https://www.reddit.com/r/BambuLab/comments/10jvjrj/p1p_losing_steps_during_color_change_but_during/
I’m getting this odd layer shift at color change. I haven’t done much with multi-color printing, but this has happened every time I’ve tried a multicolor print. It’s only the FIRST color shift. All the other colors layer just fine on top of the color shifted first layer.
I haven’t done any 3rd party mods to the print head or dust covers. It seems to shift the same way every time. I’m not sure what to do? Thoughts?
Thanks
I would attach pics or links to pics but the forum software won’t let me.