Weired extrusion problem only on one specific printer

Bambu Lab P Series Troubleshooting
1

Hi guys, I got a problem with one of the P1S printer I have, this printer was the least used in the past, days ago I was trying to print some parts in Bambu PLA, found this extrusion problem, but not with my other P1Ss and X1C nor A1.

I was testing with 1 roll of filament (Bambu PLA Matte white).
Slicer is the same (Bambu Studio)
Print plates are the same
All settings are the same
Flow-ratio are all by default

So as you can see from the photo, the right piece was printed on the problematic printer, checkout the corners, and the lines on the top surface, from the corner it looks like over-extrusion, from the surface lines it looks like under-extrusion.

The left one is printed on another P1S, which is totally fine, I also tested with my other P1Ss, X1C, A1, they are all fine.

By the way, the problem happens more obviously for PLA Basic and PLA Matte, I tested with ABS and PLA Silk+, both of them looks OK, only PLA got this problematic looking.

I tried the following steps:

  • Cleaning the extruder
  • Swap with a new nozzle
  • Adjust the tension of belts
  • all PTFE tubes check
  • direct feed or AMS feed
  • hard reset the printer

Nothing above helps.

Thanks for your tips!

WechatIMG624
WechatIMG6241920×1438 293 KB

2

Is the firmware version the same between the machines? There was an issue some time ago where some P1S machines had worse print quality than other machines. That was eventually fixed. See here: P1P/P1S and AMS Firmware Release History | Bambu Lab Wiki

Version " 01.08.01.00" says “Fixed the print quality issue that occurred on some devicess after upgrading from an earlier version.”

3

Yes, I tried with older Firmware and the latest, no help…

All the P1Ss I tested with have the latest firmware installed.

4

What about the extruder? That’s the only thing in the filament path that I don’t think you’ve swapped. If you move an extruder from a working machine, to this oddball machine, what happens?

5

Hi man, I just exchanged the extruder, not help, so finally I swapped to a completely new nozzle which solved the problem, so everything was caused by the almost new nozzle and coinsidently the one I’ve replaced for the testing also came out with bad result.

Any way, the problem was solved by replacing another hardened steel nozzle.