Suddenly the X1C has stopped printing due to the Z-axis failing to find Home. Wednesday it was printing PLA just fine, and Thursday (02-29-2024) it has a major problem. When it tries to Home the Z-Axis, the build plate rises up to just below the printhead, then cycles up and down like 6 times, never actually touching, then stops with the fail message. Sometimes the message is “The build plate is not placed properly” sometimes “Homing Z-Axis Failed.” Also, when cleaning the nozzle, the heatbed makes a “clunking” noise as it raises and lowers. I have tried changing the complete Hotend assembly, changing build plates, changing Firmware (currently 01.07.02). With the power off, I can reach under the printer and manually raise the heatbed to touch the nozzle, so there is nothing obstructing its movement. Finally, there is no up-and-down play in any of the threaded rods. I have put in a trouble report to Bambu. Can anybody offer any suggestions to try? Thanks!!
Make sure your plate is not misaligned or sitting on top of one of the rear stops. I’ve done that many times before printing the yellow guides shown in the picture.
Thank you for your suggestion. After reading this post I found the problem. Filament had accumulated in the well of the right guide post and had pushed the linear bearing up above the top of the plastic holder. Homing Z axis failed. [0300 4000 093824] - #27 by Omthetortoise
Thank you! Newbie here and that was my problem. Fixed thanks to you.
can you post a picture of where the “well of the right side guide post” is. thanks
Created an account here to say the same thing - my x1c was printing fine then all of a sudden it was errors left and right about homing and bulging beds. Turns out it was exactly what you said - the right linear bearing was pushed up. Used a pair of pliers to pop it back into place and it fixed the problem.
If anyone is googling what this issue is, look at the bearings, they should be set flush with the housing.
So I believe in the KISS method, "Keep It Simple, Stupid! The obvious starting point should be the build plate. Make sure it is orientated in the correct direction and that it is aligned with the rear stops. It’s very easy to let the build plate rest on one of the stops or both and this will cause this issue. The second place I would check is the Z-Axis, specifically with the black bracket that surrounds the screw. On occasion a poop spool will not go down the poop chute and it can fall into the bottom of the 3D printer enclosure but it can also land right on the black plastic surrounding the Z-Axis screw and this will prevent the bed from rising high enough to perform calibration.
I’ve run into both of these issues myself. I’ve pulled my plate out, cleaned my print off, turned it to get the alignment filament off, and put it back in with the front to the rear or even when putting it in properly the magnetic plate gets pulled down in one corner and misaligns the plate. With the poop spool I had been printing Halloween items and was using Orange and Black filament. Upon failure I noticed an Orange poop spool resting on the plate so I removed it and restarted everything. Little did I know that I also had a Black poop spool also resting on the bracket that I could not see because the bracket is Black, the poop spool was Black and there is not much light in the cabinet without additional lighting added to my X1C. I used my finger to trace the top of the Z-Axis bracket and actually felt the Black poop spool and removed it. When doing this make sure you don’t touch the Z-Axis screw or you may need to re-lube the screw.
I have checked everywhere for the problem. Removed the back plate of the X1 Carbon cleaned, checked the bottom. I just don’t see where the thing is getting hung up. Place a very thin paper between the plate and back wall just to see and there is plenty of room. I am so dissappointed. I have only had this thing two weeks and I get so many x axis, z axis, blah blah blah errors. I think I may have gotten a lemon. I am going to MicroCenter tomorrow or Tuesday. I cannot take this.
Uggh!
I was having Z Axis errors with my X1C and couldn’t see anything wrong with it. Just cleaned out some pieces of filament on the rods and such and now it’s printing fine.
Thanks!
This just happened to me. Thank you! I was very frustrated Z Home Error then realized that the build plate was in backwards. I flipped it around and it went back to printing fine.
We are getting this issue in the School of Art Lab that I run.
I’ve checked all the obvious stuff > bed placement, bits of filament stuck in purge chute or below the bed, bushings too high, blockages in the belts under the machine.
Our X1C goes through calibration seemingly without issue until Z reaches the lowest point flush against the bottom of the machine. When it gets there it makes a loud vibrating noise and throws the error message. We have turned the machine upside down and blown air into all the holes and places a filament blob could be stuck.
Does anyone have suggestions for what to try next?
Double-Gerry, yes, it’s okay to laugh at me. But maybe both of these can help others. I got the Z-Axis error 2 times in my 8months of owning my X1C, both STUPIDITY. Today, nothing was making sense - printer was even brought outside and totally cleaned. Followed steps to bring the plate up - and when it got just below the poop-chute my total stoner moment hit. I knew something was feeling funny putting the print plate in but (stupidly) never spotted - it was in backwards. Turned it around, and of course all works. I never pulled it out while troubleshooting so never noticed. I have put it in upside down, so instead of smooth it was pebbled and the printer told me I had the wrong plate.
The other time - printing with the top off, raised window curtains and had not noticed the plastic ends of the curtain strings were dropped and instead of hanging they went inside the top of the printer and made their way into the back left corner and hard to see. When I brought the bed up it was easy to spot when it hit them, then we saw the strings hanging in the top that we had not seen in the night time lighting.
Laughing yet? Well at least my 1st one may actually help some (dummy) out there 
Thank you! That did the trick! Filament detritus accumulated at the bottom of that well and when the plate went all the way down, it forced the upper bearing out of its housing.
I have this issue, but primarily when printing ABS. I’ve checked all of the obvious and not so obvious problems. Usually I can get it to print by moving the plate all the way up before starting the print, but not always. For lower bet temp filaments, this is never a problem.
For the more visually inclined, here are some images: An image of the well with some filament in it that shouldn’t be there, and an image of what it did to the Z-axis rod bearing, and an image of how it should look with the bearing flush.
I had to solve that, plus move the extruder above the chute in the back to clear the hotend away form the plate, and then move the plate all the way to the top. It made a click sound, and after that calibration passed again.
