This just recently started happening in the last week. All of a sudden, the printer started to make loud grinding noises and print anomalies with my prints.
I am printing the same object I have been printing for months at a time that had no issues previously. The loud grinding sound seems to be coming from the hotend like it’s rubbing or hitting the previous print layers as it is passing through. This also happens during the initial calibration before the print starts when cleaning the hotend nozzle tip at the back of the plate. I can see the hotend hit the plate and move. In fact just today it got worse and is also now scratching and rubbing the textured layer off of my PEI plate which it never did before. This happens on everything I print
I have run the calibration and always perform the bed leveling prior to print.
The prints now also continuously have blobs/abnormality patterns that did not happen before. I’m at a loss for how to fix this.
Is anyone else running into the same challenges all of a sudden?
Any recent changes?
Did this only start after a firmware update or settings change for example?
The toolhead bumping into the print after a couple of layers sounds like print warping to me, but hitting the plate itself is definitely not something I’d expect unless there was something keeping it from sitting all the way down (placed too far back and on the alignment brackets, debris under the flex plate).
I suppose it COULD be hitting the plate if the print warped and pulled the plate up, but that would have to be pretty extreme and I’m sure it would simply pull away from the plate before this happened.
Some folks adjust z-offset with the textured plate to mitigate a lack of adhesion it seems to have. Did you make any changes like this?
Recent slicer version (not sure which one) introduced a default Z-offset for PEI textured plate. Maybe you adjusted it by hand to get better adhesion in the past? Custom G-code?
I have stuck with defaults and haven’t changed any settings since I got the printer. It is the factory default. If I turn the printer off and let it rest, it seems to fix it for a little while, but then starts to happen again after a few prints.
No changes at all to any settings. Below is a picture of the PEI plate where the hotend scratched off some of the textured layer. Shutting off the printer for a while seems to help, but after a while, the problem comes back. Also added a link below to a video.
I watched the video.
This activity looks suspiciously like the process that is meant to happen at the start of every print where the nozzle intentionally rubs on that tab at the very back of the flex plate. This is meant to flatten any oozing filament on the nozzle before it checks for level, however, it is obviously happening in the wrong spot AND looks like it’s rubbing much harder than normal. It’s almost like it isn’t setting home position before starting… Actually, i’m not even sure this is normally a process that is meant to happen with the texture plate. I just don’t know on that last point.
I would definitely consider a firmware update if one is available. I remember seeing reports of this on the discord server some time ago, but haven’t heard from it since.
That is what I was thinking as well. I contacted support because it isn’t normal. previously it did that at the back end of the plate, but now it’s doing it on the actual plate itself and it just recently started doing that today.
The other day it was doing it at the back of the plate in the correct location, albeit a little lower and more aggressively than normal.
it’s definitely a head-scratcher and I’m still waiting for a reply from support. Is there a way to revert to an older firmware? I auto-update to the latest.
I saw the new post about the warped bed and was hoping it might just be that, but I checked and my bed is perfectly flat.
Sorry about the low quality of the video. I just uploaded it and Youtube is still processing the 4K version.
That video is wild. I’ve never seen it move that fast during this process. It just looks completely wrong.
However, this also doesn’t really look like a hardware problem or a problem with a sensor - I was thinking maybe some of your bed sensors don’t react as they should - but this looks like a gcode problem.
I’d try printing some of the Bambu Lab default objects in the internal memory. Power cycle and try printing one of them. I guess this won’t happen which would prove it’s a gcode problem (so something in your slicer got messed up).
yeah the speed thing also lines up with issues that others were seeing MONTHS ago on older versions of studio and firmware - so this is really weird to start seeing again
it looks like the nozzle cleaning is done on middle of the plate.
it seems the calibration / homing was going wrong…
do you use the original g-code in slicer or modified?
ikr. It seems so aggressive. It literally feels like its slamming into the walls and glass. I printed the Benchy from internal memory and it still does it, even if I power down and restart the printer. Funny thing is, if I power down overnight and come back, it’s a little better (still has issues) but after a couple of prints it’s all crazy again.
Using the original. I haven’t modified anything or attempted to change any settings. The only thing I do is load up my STL files and print and everything (and every file) was working fine up until last week.
It’s now doing the nozzle cleaning in the right place
Seems to be less aggressive and not slamming into things
Benchy is printing without issues so far
Seems to be fixed, however, it has been shut down for a while which previously made things better. I’ll have to see if the problem comes back after a few prints like the previous times before.
In the video your machine is definitely ill. After homing Z it is supposed to go back to wipe the nozzle 5 times then go to the sticking out tab at the back to clean the nozzle on the plate.
It makes a squeek and gets nowhere near where it is supposed to be to wipe the nozzle. It is wrong in X and Y which being a core XY machine probably means a problem with only one motor/belt.
Could it have been in ludicrous mode? The modes carry over from print to print. You would hope it wouldn’t mess up that badly, but, who knows?
That’s also what I thought after reading some other threads, but I checked and it wasn’t in ludicrous mode, although it really seemed like it was. It was set to Standard. Nonetheless, all seems ok now after the factory reset, but only time will tell - I’ll do a few more prints and report back.
Hey has your problem been fixed in the long run I got my printer a couple days ago and everything worked so great I was really thought this printer was the one until out of nowhere I didn’t change a single thing the nozzle started to scratch pei plate really bad and made this awful sound I tried to recalibrate it but I’m going to do the factory reset I wanted to know if ur problems was fixed in the long run and u no longer have this problem
