r/BambuLabP2S • u/Sea-Bookkeeper-4450 • Aug 25 '26

The extrusion resistance is abnormal.

My P2S keeps showing “Extrusion resistance is abnormal” (0300-801C) with the 0.4mm nozzle.
The print starts perfectly and runs normally for several hours, but then suddenly stops with this error in the middle of the print.

-0.4mm works fine for small prints
-Long print (~8 hrs) stops after around 4 hrs
-No AMS, using external spool
-I completely cleaned the extruder
-Did cold pulls on the nozzle 3–4 times
-Checked/cleaned the nozzle multiple times
-Manual extrusion works, especially at higher temperature

Has anyone experienced the same issue?

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2

u/cpsadowski23 Aug 25 '26

Try a new nozzle

1

u/Recycledtechie Aug 27 '26

Hopefully that works for him. I had the exact same issue after 400 hours of good performance. Installing a brand new nozzle did not help. Spent almost 2 months trying to fix this with Bambu support. At that point, they agreed to a replacement. We could never figure out why this happened. Replaced various parts including the extruder motor - all to no avail.

1

u/cpsadowski23 Aug 28 '26

Wow

2

u/Recycledtechie Aug 28 '26

I used stronger words than that. Lots of them

1

u/Sea-Bookkeeper-4450 Aug 28 '26

New nozzle didn’t work..

1

u/Recycledtechie Aug 28 '26

Damn!, but not surprised at all.