Brand NEW A1; Can't Calibrate + "...homing Z axis failed

Bambu Lab A1 Series Troubleshooting
1

(apologies up front if this is a bit long-winded, want to convey what I’ve done to try and resolve)

Hello! and thank you in advance for any suggestions/resolutions - I finished setting up a brand new A1 Combo a couple hours ago, connected to my wifi network and began the calibration process. Nope.
What occurs:
•The Z axis will travel upward about 20mm, then back down 20mm where it started
•Then back up 20mm, to the right about 20mm, to the left all the way to the filament cutter (that I took off; which was something mentioned in a post, and on a YouTube video).
•The bed will move all the way back, then forward half way while simultaneously the print head will travel to the middle
•Next, the print head will raise only about 10-20mm and generate the Calibration Failed message.

The pop up Error has given different codes, yet identical verbiage: “Printing stopped because homing Z axis failed”
[0300-40000 041530]
[0300-04000 041545]
[0300-04000 041608]
[0300-04000 041617]
[0300-04000 041633]

• Machine Assist shows (2) issues:
1. “The toolhead is malfunctioning, please restart”
2. “The data from extrusion force sensor is abnormal, the sensor should be broken”

Attempts to resolve:
• Visually verified to ensure no debris in either lead screws
• Also checked for any debris in the belts
• Disconnected the AMS Lite unit; just in case…
• I have removed the cutter from the rail; mentioned as a fix/resolution
• I followed each of the guides within Bambu Handy, read through related posts, searched YT etc. to no avail.
• USB-C underneath; and on top of the print head; checked, removed, refastened, checked again and repeated the process a second time.
• The guide for the extrusion force sensor… I took the back plate off the print head, checked the two posts to see if were proper and tighten; they were, and checked again to make sure not loose.
• I also removed the device from my app, then re-added it; just for giggles as sometimes that resolves issues for other things.

Incredibly frustrating to say the least, if anyone has a fix/resolution to pass along please do, as I’m really not looking forward to boxing everything back up and returning it - ugh.

2

Hi there, @Momarineprepper,

I am sorry to read about your unpleasant experience.

I don’t have a solution, and as it is a new printer, I advise gathering the printer logs and opening a trouble ticket.
While waiting, record (film) the problem and all the steps you did to identify the cause following troubleshooting indications. Write or print the troubleshooting number on paper and use it when recording the video, i.e., make it visible within the printer or nearby.
Add this record to the trouble ticket.
Your printer likely has a faulty component, and the swift solution is for BL to post a new one for you.

If the problem is solved, you cancel the trouble ticket.

2 Likes
3

I have the same problem. I switched to a 2mm nozzle and that worked fine. Then this morning I switched to a 4mm hardened steel nozzle. After I did this, I always get the same message as you did.

I’m going to try reinserting the nozzle and see what happens, as that was the last change to my printer.

4

My problem was solved. Unfortunately, I did two things without checking in between.

  1. I reinserted my nozzle (0.4mm hardened steel).
  2. I made sure that the bed was properly seated; even a little off and I got the error.

I suspected #1 because the last time it printed right was right before I changed the nozzle.

#2 was commented on in some other threads.

At any rate, doing both of the above fixed the problem for me and I have a print running as I type.