Nozzle grinding on infill all of a sudden? Why?

I have done nothing different and now this is happening: I continue to have random problems with my X1C and I am never sure why these things are occurring out of nowhere. I am disable all the “AI” specific stuff and recalibrating and will be trying again. I hear about everyone loving this thing and yes I have had some success with it - but each time something new comes up I am sure it has something to do with the way it auto scans and calibrates and the Z-index is either too low or too high.

I have printed this model plenty of times - this damn auto-calibration BS is causing incorrect z-index I feel.

This is a copy/paste to my original reply to your related post earlier.It looked to me in the video that the infill was nowhere near flat. I have seen a couple of times where the nozzle wipe that happens just before printing starts seems to bump the z height a tenth or two (not always, but occasionally) and gets the Z off a few steps.
Either that, or the homing sequence was off due to lead screw binding and it didn’t get the Z set correctly.
This can lead to layer adhesion issues and cause a print fail with exactly those symptoms. The infill gets bumpy and “muddy” scrapes the nozzle, and causes runaway problems as the nozzle continues to deposit filament.

There really is nothing to do except to cancel the print, and restart it. Make sure you have the auto leveling enabled, make sure the plate is located on the bed properly, and if you haven’t done a manual flow calibration, enable the flow calibration. That should reset things and get you back to normal.
Once the auto calibration is done, if you turn it off, it will continue to use the stored auto values until you recalibrate, so it isn’t truly necessary to run it every print.


thank so much - appreciate your knowledge on this

No problem. Happy to help.

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Make sure to run the bed level check prior to the print for a few prints. It may be out of whack. People forget, magnetic plates are not perfectly flat. Flipping them over or indexing them different can cause deviation. Like many of us, not everyone runs bed leveling on every print, so its possible the old bed mesh is causing interference.

If that isn’t the problem, I’ve seen that happen when printing a filament too fast. To determine the max speed you can print a certain filament, you’ll need to run a max flow rate test like from Orca slicer. I had some PLA Pro from Polymaker and that stuff had to be printed significantly slower than my BBL filaments. If not, it would rub because of the rough extrusion from the previous layer’s printing. Also wet filament can do that as well.


Thank you all I appreciate the knowledge here

This happens with the latest software release and using the grid infill. It is like the Z is too low on just the infill and it drags across the grid. Use the previous release to slice and i bet your issues go away. Good luck.

Grid infill has always been a problem, it’s not something software version related.


it has never caused me issues before. Not like this anyway. same every thing besides code base and mine started having issues with the last upgrade. I went back to a prior release and it resolved. Seems software related to me.

I agree. I’m seeing similar problems. It seems that there have been some changes in the initial calibration, especially when changing filaments with AMS. When the filament loads, it doesn’t fully clear the old filament, and it winds up oozing a little turd of plastic which then sticks to the nozzle. The wipe at the back of the plate shoves the turd higher up into the nozzle where it remains until the print starts. It then falls onto the layers of the print, and the head crashes into it disrupting the layer… It usually gets worse after that.

That video indicates the calibration wasn’t run. I’m guessing the bed leveling was skipped as well. :face_with_spiral_eyes:

I wish that was the case - this is one of those issues where I simply repeated a print after just having a successful print. I did not touch any of the settings. This has been happening to me since I got this printer.

I don’t know that it matters, but in your video it looks like some kind of dodgy after-market build plate. Does it happen just the same with the officially sanctioned build plate?

Well - That is the official sanctioned plate - it is the bambu labs textured PEI plate that came with it.

Just to reiterate as stated in the opening discussion this is the second print. I had a successful print with no issues and I decided to print another one and then this happened. I have seen people state that the auto leveling measurements don’t always calculate correctly and either calculate too low or too high. That’s the issue. I opened up a case with Support and they told me to “clean the bed with alcohol”. Yup that’s what they said.

I suppose if one or more of the force sensors were faulty it might construct a faulty bed leveling map.

Edit: unfortunately, it’s out of stock… which means people are replacing them for some reason, or else they’d be in stock.