this post was submitted on 23 Feb 2025
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What Exactly is the Issue with my Bambu P1S...? It Both Under and Overextrudes in Batched areas and sometimes leaves what looks like Overheated/Melted Ripples? (lemmy.blahaj.zone)
submitted 18 hours ago* (last edited 18 hours ago) by Mr_Mofu@lemmy.blahaj.zone to c/3dprinting@lemmy.world
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I really don't know whats happening. Especially with the Over and Underextruding... Heck the Bottom Left pic shows both happening basically right next to eachother... whats going on?

(The Printed Model in the pic is just the Entire First layer and buildplate printed in. Letting it Run a Third time now to see if the Patterns stay the same)

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[–] dual_sport_dork@lemmy.world 13 points 14 hours ago

Left field suggestion, also: Make sure there isn't anything trapped under your build plate. If you have any shreds of filament or flakes of old supports or whatever between the steel plate and its magnetic base, the surface won't be flat to a degree that the auto leveling probably won't be able to deal with it and you'll get all kinds of crazy unpredictable results.

I did this on my Qidi once. I'm glad I noticed before going crazy with troubleshooting. I had black filament scraps on the black magnetic base, which were practically invisible and I only found them by feel.

[–] ThePantser@lemmy.world 15 points 18 hours ago* (last edited 18 hours ago)

That is a bed leveling issue. It's too far away where there are gaps and too close where there is rippling. Run a bed leveling procedure and if the model allows for manual leveling you should go through that and then do another mesh leveling.

Also clean your build plate with soap and water and avoid touching it with bare hands.

[–] bblkargonaut@lemmy.world 3 points 13 hours ago

Need more information to properly diagnose. Is this a new issue? Are you using auto build leveling for every print? Have you tried cleaning everything and rerunning the system calibration? A lot of different things can cause similar issues and it's hard to diagnose from images alone.

[–] Moose@moose.best 4 points 14 hours ago

Has it always done this or is this a new issue? I agree with what someone else said, I think this is likely a bed leveling issue. The P1S uses pressure sensing using it's nozzle for bed leveling. If the screws holding the hotend in place aren't tight enough, it might be giving you poor readouts. This could happen after a nozzle swap if you've done one before. Same if the print head itself has a lot of play in it for some reason, it would throw off the results.

[–] RejZoR@lemmy.ml 5 points 16 hours ago

Looks like leveling issue indeed. In some places nozzle scrapes the filament from the bed being too close and piles it up and in others the distance is too high so it doesn't expand enough on surface when leaving nozzle to connect with adjecent already printed lines.

[–] Zikeji@programming.dev 6 points 18 hours ago (2 children)

My first impression from the adhesion issue (which doesn't appear to be the main issue of this post) is that you may need to clean your build plate. But considering it was relatively good as it is, I assume you did and the few spots may just be accidental touches to the surface. In either case, their guide is here: https://wiki.bambulab.com/en/filament-acc/acc/pei-plate-clean-guide

As for the extrusion issue - considering the apparent randomness of it my guess would be either an issue with the filament or a partial clog.

[–] j4k3@lemmy.world 3 points 17 hours ago

It can't be filament or a clog. The length of each diagonal extrusion path changes, so it is impossible for that to align perfectly with a pattern on the build plate like this.

It could be contamination of the build plate, or an issue with sensor noise related to however the the bu checks for bed height. Depending on method of bed height sensing, it could also be related to bed leveling versus the sensor mapping resolution. Again, this is just a general hardware assessment. I don't know the specifics of how this machine works and have no interest in learning anything about it. Hardware wise these are the issues I can think of. It also looks like a high first layer to me, with an additional issue too.

[–] rugburn@lemmynsfw.com 2 points 17 hours ago

I had this happen on my p1s with a roll of Inland pla, but not with a roll of their pla +, I also noticed my nozzle was worn (who knew that after 850 hours you should probably replace it). Haven't gone back to the normal pla yet, but those might be things to look at?

[–] Autonymous@lemmy.dbzer0.com 3 points 16 hours ago

Check your extruder tensioner and calibrate bed level?