I am printing since months my part with two Bambu X1C. Everything worked fine. Now suddenly, I got this strange effects on the backside of by prints.
I am using the Bambu Textured PEI Plate.
I am using original Bambu matte black PLA Filanment.
I am cleaning the Plate with isopropyl alcohol just before i start the print.
Again, this is what I have done always and it worked nicely. The only thing changed, I got new pack of 8pcs of Bambu PLA matte. Als I noticed, that the prints to stick stronger to the plate now.
Are your photos of one side and then the other side of the plate? You get washout look on one and big circle on the other? Or it varies?
The washout seems like residue from washing, do you only ever use IPA, or do you also use dish soap?
I think the above is just good info to have for troubleshooting, it could be the batch of filament.
I might be off base here but what I would do is heat the plate on the printer to 100C, now its very very HOT so BE CAREFUL. Hit it with a green pad or similar scrubber, then wash in hot water with dish soap and rinse well. This is an attempt to remove any foreign residue.
Are your photos of one side and then the other side of the plate?
It varies from print to print. Everything looks different. There is no pattern.
The washout seems like residue from washing, do you only ever use IPA, or do you also use dish soap?
Yes, I have tried to wash the plates with dish soap also before. The effect was there before and did not go away. I also tried screen cleaner, which maybe was a mistake. But that was also after i have seen this spots.
I guess I will buy a new plate and new filanment and see if the issue persists.
Could the formulation of the Bambu matte PLA have changed, yep there is a chance.
From my experience with Polyterra matte filaments they can sometimes stick too well to textured PEI build plates which then can create “stress whitening marks” on the part surface when I’m inpatient and not wait for complete cool down before peeling it off the build plate, so better let it cool down completely or stick the build plate with the part into the freezer for 5 minutes and the parts then should comes off without problems and stress marks.
Another thing that can happen is that the build plate gets contaminated with stuck on filament micro particles and those won’t get removed with either dish washing soap or IPA. Wiping down the build plate with an Acetone soaked rag can help there but I precaution that Acetone can damage the PEI surface if it is soaked for too long and if the build plate is hot since that reduces the chemical resistance of the PEI significantly. Also make sure that the rag you use doesn’t get dissolved by the Acetone
I just purchased some Bambu Matte red a few months ago. I haven’t used their matte PLA before. It left marks on the Smooth PEI plate and I definitely waited until it completely cooled, the marks won’t come off no matter if I clean it with soap or IPA. I haven’t tried acetone.
Also, when I removed the Bambu support for PLA, the surface of the Matte PLA wasn’t smooth at all and it was extra hard to get the support material off. I haven’t used the matte PLA since then and if I use it again, I will use glue on the plate. I definitely won’t buy it again.
There I would recommend using a fine layer of super/extra hold hairspray instead of glue as it applies thinner and more evenly while still providing an intermediate layer that prevents such “sticky filaments” to leave stuck on microparticles on the PEI.
If I need to use some kind of glue, I use hairspray when I care about the bottom, but I do 3 light coats (waiting to dry in between) as @Olias previously suggested to get a nice smooth surface. When I don’t care about the bottom and want faster and easier application and glue removal I use a glue stick or liquid glue.
So I can confirm: It is defenitifly the Bambu PLA Matte Filament. It sticks too strong to the plate. When remove the part, the part surface gets damaged, which results in this visible spots.
Strange because I use a few rolls of Bambu PLA matte black a week and have not seen that issue. I use it mostly on a 3d effects sheet recently but have also used it on textured with good results. I live in Arizona so very low humidity usually.
Matte Black does the same thing to me… I mitigate it by:
keeping the plate clean
waiting until the bed it completely cool before trying to remove it.
Maybe its just the batch I have because some people say its never been an issue to use the matte PLA form BB.
This has been happening with me with PETG HF on the textured plate. I think it’s because I am pulling it off while it’s too hot/right when it finished. Needs to cool.
PETG loves to stick to the textured plate, even when cool.
I mentioned it in another thread, use glue.
Sounds counterintuitive but the glue acts like a release agent. It won’t interfere with adhesion but it will facilitate removing from the bed easily.
Put glue on ped, use slightly damp cloth to even out the layer and spread it. Print on it, profit.
I got feedback from Bambu Support. They recommend:
Changing the infill from grid to either honeycomb or gyroid.
Use 3DLac spray
Please ensure that the build plate has cooled to room temperature before trying to remove the model
I have tried 3DLay and it slightly improves the quality. But it ads more pre- and post processing time and the part smells. Unfortunatly not really a good option.
I told support, it would be great if the can let us know, when they change the filament or introduce a version system or similar.
