New H3C – abnormal noise After 16hrs

Bambu Lab H2 Series Troubleshooting
1

Hi all, I just got my H3C and I’m hearing an abnormal noise that seems to be coming from the rear stepper motors. Video attached.

It’s brand new with about 18 hours of total print time. I printed several models, about 16 hours’ worth, with no issues, then this noise showed up and now it happens constantly on every print.

I already retensioned the X and Y belts but the noise is still there. I’m on the latest firmware (01.01.03.00) and I have a support ticket open with Bambu.

Has anyone else with an H3C heard this from the rear motors? Is it a known issue, or is there anything else I should check like motor mounts, pulleys or lubrication while I wait on support?

https://youtube.com/shorts/EV1kUwVk-8E?is=zvYYpDmsNq8h2CFd

2

Do you mean that “click click click click” that mostly happens on just one side of the perimeter?

3

I would check to see if that noise is possibly coming from the one of the filament buffers.

4

Yes. There is also an abnormal noise near the tool head as well. The clicking is consistently present while the tool head noise only appeared on the round sections of the model.

5

It seemed to be coming from the left rear stepper motor and the tool head but I’ll check it again. One new finding- The clicking is present with the machine powered off and manually moving the tool head.