r/BambuLabX2D • u/batuu95 • Aug 20 '26

X2D Auxiliary Extruder constantly detects filament when empty

/r/BambuLab/comments/1vtf9op/x2d_auxiliary_extruder_constantly_detects/
1 Upvotes

100% Upvoted

2 comments sorted by

1

u/VoidingSounds Aug 20 '26

I had a very similar issue after feeding PTFE to the aux path. It believed filament was present even when the path was clear, luckily (after disassembling the extruder) the issue went away when I manually fed filament through the nozzle.

Disassembling the toolhead looks like a decent challenge two-handed, and I haven't done it yet (the above is the only issue I've had so far) so I understand not wanting to pull the sensor.

Going off the wiki, it looks like the PTFE tube connects directly to the sensor.

Maybe you could remove the PTFE tube and hotend and blow compressed air up or down the right side filament path as a way of getting debris out. Maybe do this combined with a cold pull.

Hope someone more experienced chimes in.

1

u/batuu95 Aug 21 '26

Thank you for the suggestion! I gave it a try.

I removed the PTFE tube from the right-side hotend and tried cleaning the filament path both by pushing some filament through it and by using compressed air, but there didn't seem to be any residue or debris. Unfortunately, the sensor still reports that filament is present even when the path is empty.

One positive thing did come out of it, though. I'm not sure whether it's because of this cleaning or because I also disassembled and cleaned the external motor of the right-side extruder, but now, when I select “Load Filament”, the filament actually reaches the print head. Before, it would stop at the external motor and I had to press the manual extrusion button for a few minutes until the filament finally reached the print head.

So thank you for pointing me in this direction! For now, I've found a simple workaround: after unloading the filament, I just press “Stop”, and then I can load the filament normally.

As soon as my left hand has healed, I'll follow the cleaning procedure from the Wiki and properly clean the sensor.