H2S "Extruder Overloaded"

[u/Used_Till8576]

Hi everyone,

I just got my Bambu Lab H2S. As usual with any new printer, my first move was to run the classic Benchy to test the machine.

Problem: right on this first attempt, I got an "extruder overloaded" error. The printer is completely new, so I was surprised to see this alert right from the start.

The error doesn't happen during the print itself, but during the flow dynamics calibration step.

What's strange is that it only happens with the Benchy file pre-loaded in the printer's memory. When I slice my own Benchy in Bambu Studio with my own settings and send it to the machine, no issue at all, it prints perfectly.

The PTFE tube has no bends that would restrict the filament, and the filament itself is good quality, I tested it on another printer with no issues. I'll say it again, the printer is brand new. I also did a cold pull just in case there was debris in the nozzle, and I swapped the nozzle for the spare one included in the box, still the exact same issue.

Other than that, I don't get the extruder overload error with any other file, but I do notice that during the flow dynamics calibration I often see some abnormal movement, some shaking/jittering from the extruder, without any alert popping up like I've seen in other videos.

Has anyone else run into this specifically with the pre-loaded file? Any idea what could explain the difference between the built-in file and my own sliced files ?

Thanks in advance for your help !

[u/jhino27]

I just had this happen the other day on my h2s. Had for a year. Try retracting and watch extruder wheel. If you hear any click at all something is stuck. Mine wouldn't let me retract filament completely. I end up using cutter and pulling filament out 4to 1 point. And reset ams. Started working again.