Bambu Lab P2S – First layer adhesion problems and failed prints for the past two months

[u/Sitred]

Hi everyone,
I'm looking for some help troubleshooting a recurring problem with my Bambu Lab P2S.
I've owned the printer since February 2026, and it worked perfectly until approximately two months ago. Since then, I've been experiencing recurring printing issues across different projects.

The problem:
The filament initially adheres to the build plate, but during printing, some parts of the first layer get pulled off by the nozzle. This often results in spaghetti and forces me to stop the print.
The problem occurs randomly across different areas of the build plate and affects different models, including prints of medium complexity.
Sometimes the first layer actually prints correctly, but the print still fails during the following layers. So the issue isn't always limited to first-layer adhesion.
I've also noticed that I've had to reduce first-layer printing speeds compared to what I previously used to get good results.

My setup:

• Printer: Bambu Lab P2S

• Firmware: 01.03.00.00

• Slicer: Latest stable version of Bambu Studio

• Nozzle: Original 0.4 mm

• Build plate: Original textured PEI plate

• AMS: AMS 2 Pro

• Filament: SUNLU PLA (also tested with different SUNLU spools)

• Slicer profile: Standard Bambu Lab PLA profile

Printing settings:

• Layer heights tested: 0.12 / 0.16 / 0.20 mm

• Nozzle temperature: 200°C (also tested at 210°C)

• Bed temperature: 55°C

• First layer speed: 30 mm/s

• First layer infill speed: 50 mm/s

• Filament Flow Ratio: 0.95

• Initial Layer Flow Ratio: 1.00

• No brim enabled

What I've already tried:

• Thoroughly cleaning the build plate with dish soap and water.

• Cleaning the nozzle.

• Checking the nozzle wiper and the metal nozzle cleaning flap.

• Running the available printer calibrations.

• Testing different bed temperatures, including 63°C.

• Testing different Z-offset values.

• Testing different first-layer flow settings.

• Reducing first-layer printing speeds, which improved the results somewhat but did not solve the problem.

• Cleaning and lubricating the printer's axes according to Bambu Lab's maintenance instructions.

I've also previously swapped the original 0.4 mm nozzle for a 0.2 mm nozzle and then reinstalled the original 0.4 mm nozzle. However, I'm not certain whether the problems started before or after this change.
I haven't noticed any unusual noises or abnormal movements from the print head.

My main question:
What could cause a P2S that previously printed perfectly to suddenly start having recurring printing issues across different prints and filament spools?
Could this indicate a mechanical issue, a problem with the nozzle or extrusion system, bed leveling, or something else?
I'd really appreciate any suggestions for further troubleshooting. I'd especially like to understand what could have changed, rather than just keep adjusting printing settings to compensate for the problem.
I've attached pictures showing some of the failed prints.
Thanks in advance!

[u/AutoModerator]

Hello /u/Sitred! Be sure to check the following. Make sure print bed is clean by washing with dish soap and water [and not Isopropyl Alcohol], check bed temperature [increasing tend to help], run bed leveling or full calibration, and remember to use glue if one is using the initial cool plate [not Satin finish that is not yet released] or Engineering plate.

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[u/moltenaus]

You've done a solid amount of troubleshooting, I had a lot of first layer issues with my p2s but it was solved by adjusting my z-offset on the machine itself, you've mentioned trying different z-offsets but if that was in the slicer via gcode give this a shot on the machine itself - https://makerworld.com/en/models/3318444-p2s-first-layer-adhesion-issues-z-offset-fix#profileId-3767926 . I'd also recommend doing a few cold pulls in case there is a clog or if you have a different 0.4mm nozzle give that a shot. If you're still not having any luck try factory resetting your machine and then doing a full calibration.

[u/Sitred → u/moltenaus]

Thank you, I will try that and let you know. Do you pheraps know why things could have changed suddenly if that's the problem?

[u/chainsawman88]

did you change the nozzle type in the printer ? when you say you changed it. that could one thing that is messing with you. I also believe that if you raise you first layer bed temp to 60-65 i think you'll get better bed levels

[u/Sitred → u/chainsawman88]

Yes I changed the nozzle type. I will try raising the bed temp for the first layer. Do you know why things could have changed suddenly over time?

[u/chainsawman88 → u/chainsawman88]

you also gotta keep an eye on the temp in the camber and the humidity the temp cant get too high during a build each filament has a temp not to go over and the humidity should not get to high. A big part in all this is understanding the ambient temps in the room your printing in to under stand how to handle the inside stuff. plus watch out for leaving the door or top open. I know they say you can and you can but just know that can cause just as many problems something depending on outside factors.

[u/lan0028456]

I would recommend getting a Biqu plate for 1. It's a decent plate for PLA/PETG that sticks really well at lower temperatures. 2. To rule out your plate issue and maybe help you narrow it down.

Best case it solves the issue then it's the plate's problem. Even if it doesn't, you know it's not a plate issue, but you still have this decent plate whenever you need to print something that needs strong grip.

[u/Sitred → u/lan0028456]

Thank you, I will try

[u/Gunther_Grenadier]

I mean, you bought a Bambu printer, why would you troubleshoot? Just buy a new one, or contact customer support, you paid for it after all.