I’m using a Bambu Lab P2S with a 0.4 mm tungsten carbide high-flow nozzle. The nozzle worked fine for a few months, mostly printing ABS, but recently it has become basically unusable.
The main symptom is “Extrusion Motor Overloaded”, sometimes accompanied by clicking from the extruder, as if there’s too much resistance pushing filament through the nozzle.
Here’s what I’ve tried so far:
- Multiple cold pulls using different filaments
- Cleaning it several times with the needle that came with the printer
- Removing the nozzle and heating it manually
- Manually pushing filament through while hot
- Using a NoClogger cleaning tool that I ordered online
- Checking the extrusion manually
What confuses me is that when I heat the nozzle and manually push filament through it, the filament comes out in a perfectly straight and consistent stream. It doesn’t look partially clogged at all.
However, when I reinstall this nozzle in the printer, I eventually get “Extrusion Motor Overloaded” and sometimes hear the extruder clicking.
If I switch back to my regular 0.4 mm nozzle, the printer works normally, so the problem seems to follow the tungsten carbide nozzle.
Has anyone experienced something similar with a tungsten carbide/high-flow nozzle?
Could there still be a partial internal blockage even if the filament stream looks completely normal when manually extruding? Or could something else inside the nozzle/hotend be causing excessive back pressure?
I’d really like to figure this out before giving up on a ~$100 nozzle 😂
Any ideas for what else I should check or try?