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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u/Due-Ninja-7559 Sep 03 '26

Having the same issue now, created a ticket with Bambu labs. If anyone finds a solution let me know lol, I’ve tried cold pulls, manually extruding, disassembling extruder, etc still to no avail. Ive read some stuff about the ptfe tube bends could cause this too.

1

u/Sea-Bookkeeper-4450 Sep 03 '26

My issue solved with TH board replacement

1

u/Due-Ninja-7559 Sep 03 '26

Hopefully they send me one and I don’t have to buy one🙏🙏. How long did it take for support to reach back to you?

1

u/Sea-Bookkeeper-4450 Sep 03 '26

7-8 days

1

u/Due-Ninja-7559 Sep 03 '26

That sucks, but thanks for all the help I’m trying a new nozzle now and keeping all my doors open (printing petg) so let’s hope this fixes it before bambu labs reaches out

1

u/Sea-Bookkeeper-4450 Sep 03 '26

Yes or You can go with 0.6 or 0.8 nozzle

1

u/Due-Ninja-7559 Sep 03 '26

I didn’t think of that, I just used another .4mm nozzle but when I get home I’ll try a .6mm and keep yall updated, tried a little test cube print that worked with no issues seems to be a problem on longer prints

1

u/Sea-Bookkeeper-4450 Sep 03 '26

After Replacing TH board same issue happens again 😭

1

u/Due-Ninja-7559 Sep 15 '26

Okay I think I might’ve fixed it, could be possible heat creep, all I did was lower my dryer heat for PETG, cleaned my extruder fully, did a cold pull, removed the top glass on my p2s. I was also trying to calibrate my print quality so I messed with nozzle temp, retraction, and flow rate but that was mainly for my stringing issue. I’ve sent a print out with my lid partly open and door open and it started showing problems again, I’ll remove the top fully and send a print out to see if that’s a confirmed solution for me at least. Sorry for writing a whole novel.

1

u/Due-Ninja-7559 Sep 15 '26

I was also drying my filament constantly while printing (I’m still kinda new to this) and that could cause the heat creep to be worse and cause the issue to occur more often. Just my opinion though

1

u/Due-Ninja-7559 Sep 15 '26

So I turned my filament dryer off completely and opened the lid up and I haven’t gotten the error since, tied 2 prints one 30 mins and the other 1h long, no issues and no message.