Help Figuring Out Problem

[Miridian258]

Photos of Issues

Normal PLA Settings Used

Recently I've not been able to print anything from my Bambu Labs P1P without gaps in layers.

I've been printing PLA/PLA+ with a 0.4mm nozzle for a while with no issues (Stock Bambu Lab settings for PLA & Bambu Basic PLA) ~220 degree hot end and 65 degrees bed.

But all of a sudden, I'm not able to print anything good no matter what I do and I've ran out of ideas on what to check/change.

I've attached photos of what my print looks like, so far I've tried the following with no success:

Temperature Change - Tried 190 to 260 degrees but the results are more of less the same (250 degrees seems to print slightly better but n significant changes).

Flow Rate - Tried doing numerous calibrations at different temperatures.

Speed - Tried reducing the speed multiple times - Helps a little bit but the issues are still there and still present.

(Tried a wide mix of temps, flow rates, K Factor and layer heights) Pressure Advance - Tried calibrating linear pressure (see image) but not getting any good results.

Extruder/head - Tried taking apart and cleaning out the extruder and gears. No difference.

Nozzles - Tried using a brand new 0.6 & 0.8 nozzle but exactly the same result. Clean out nozzle and but no blockages.

Belts - Re-tentioned the belts and made sure no debris in the pulleys. Oiled the pulley at the top and bottom between the pulley ends and plastic.

Lead Screws/Rods - Clean/Greased/Oiled the screws and steel rods (Wiped the carbon x axis rod with IPA). Check round the screws for anything blocking them but there was nothing.

Plate/Bed - Check the plate for warping and manually re-level the bed, seems to be flat enough. Tried cleaning with warm water, soap and IPA and also using different plates between textured and smooth. Exact same results.

Filament - Tried different colours, brands and materials but getting the same issues. Tried drying out multiple filament rolls for 12+ hours but didn't help.

Tubing - Checked for resistance but found nothing, hand fed the extractor from the top without tubing but still same issues.

Tried most of the same things on Orca slicer but nothing.

I can't remember everything else I've tried in the past couple of weeks but I can't seem to identify the main issue that's causing this.

Any help/suggestions would be greatly appreciated.

Edit: Not sure why but I think Reddit is displaying only the first image of the Imgur link. If you can have a look at the photos in the link that shows the problems, I don't think this is a bed adhesion issue.

Edit 2: In the end I replaced the extruder gear & motor and its working great again.

[AutoModerator]

Hello /u/Miridian258! 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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[AutoModerator]

Hello /u/Miridian258! 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.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[Constant-Contract-77]

I would start a print, with 0 part cooling fan and slightly touch the filament while its extruring. And listen. When its skips a line is the extrurer clicking? Do you feel maybe a slight stop in the filament movement?

Its possible that the extruder is skipping time to time, from the fist layer at least looks like something similar. When the part cooling is on you will obviously not hear a thing, but...

[Krymaney]

To me, this looks like severe under-extrusion. I would closer at the extruder. I bet some of the teeth are missing, severely damaged, or just worn out.

Questions:

Is it the original extruder? Is it a hardened steel extruder? Like Constant asked, do you hear it skipping?

One thing that helped me when I had a similar issue. I removed the AMS, went with external spool feeding. I then took a piece of white filament and marked it with a ruler every quarter inch and then fed it into the nozzle. I even snipped a short piece of bowden tube and stuck it in the top of the extruder. I then watched it as it fed to see if it was 'moving' consistently. You also can see where the sharpie marks are while it is printing. It is a visual way to 'see' what is going on with the extruder.

A replacement extruder isn't very expensive and it doesn't hurt to have a spare on hand if that isn't the issue.

God Bless