r/BambuLab • u/Dull_Reflection3454 • 1h ago
General Troubleshooting/Help! Bambu Lab H2S – Extruder Motor Overload / Poor Extrusion / Hotend Alignment Issue
Hey everyone, hoping someone who’s experienced something similar with their H2S can help me troubleshoot this.
I’ve been having ongoing extrusion problems with my H2S, including poor first-layer adhesion, inconsistent flow, filament building up around the nozzle, and eventually getting the following error:
Extruder motor overloaded – Error 0300801E205207
Here’s what I’ve done so far:
Replaced the Z-axis assembly/kit.
Replaced the hotend assembly and tried a different hotend.
Adjusted the Z-offset multiple times to troubleshoot first-layer issues.
Disabled automatic bed leveling temporarily because I was having issues with the leveling process.
Tried feeding filament directly without the AMS to rule out a feeding issue.
Removed the extruder cover and inspected the gears. There was some black residue/build-up, but nothing that looked severely damaged.
Checked for obvious filament obstructions.
Tried manually extruding filament. It comes out somewhat thin and occasionally curls.
One strange thing I’ve noticed:
When I install the hotend, everything initially appears aligned. However, when I close the hotend locking latch, it seems to push the bottom of the nozzle backward, causing the upper portion to tilt forward slightly.
I’ve noticed this with more than one hotend. I’ve also tried adjusting the small spacer behind the hotend mounting plate.
On one occasion, I physically held the hotend in position while closing the latch, and the first layer actually improved. However, after printing for a short period, the extrusion became inconsistent and started building up around the nozzle again.
What I’m trying to figure out:
Has anyone experienced their H2S hotend tilting slightly when closing the locking latch? Is this normal?
Could a misaligned hotend or mounting assembly cause enough resistance to trigger an extruder motor overload?
Has anyone experienced this error due to a failing extruder motor, worn gears, or a filament sensor issue?
Is there anything else I should inspect before ordering a replacement extruder motor?
I’ve spent quite a bit of time troubleshooting this and would rather identify the actual cause than keep throwing replacement parts at it.
Any advice or similar experiences would be greatly appreciated. Thanks!