These diagonal bands have randomly started showing up on some of my prints.
After this print, and following the P1 series Wiki on maintenance, I’ve cleaned the carbon X-Axis rods with IPA and cleaned the Y-Axis rods with IPA and re-greased (lightly) with the included grease. The yellow extruder gear appears clean.
I’ve had my P1S w/AMS for about a month now and this was its first cleaning.
Is there anything else I should check/clean/lub ?
Thanks!
Problems can grow in over time from things maybe getting loose or worn, but over one month from new and since you didn’t mention it, my money is on filament moisture.
It happens over and over. People get a printer and things work ok for a while as the filament gradually absorbs more and more water. Then one day artifacts start appearing.
It might be something else but the first thing I would look into is just drying the filament some. It only needs to be dry enough to print well.
FYI: this is PLA Matte.
I keep it in vaccumed zip-lock bags with desiccant. And I dried this latest roll of brown at 50c before using. But the banding reappeared in this snake model print:
The Matte Black from before was in AMS slot 3 while the Matte Brown in the lastest print was from slot 1, so it does not appear to be AMS slot related.
I’ve also checked all the bowden connectors and they all seem secure and fully seated.
Any other ideas?
Thanks!
The skull photos look good overall and might not be water. The thing about water is it’s a process where if things were working before, certain aspects of a print that are affected by filament behavior can start to change so you don’t get full-blown spaghetti all at once. Changing to another spool or letting things sit where a spool that printed great before absorbs some amount of water and prints poorly can see big changes though.
Do you monitor the humidity in the vacuumed bags with desiccant? The reason I ask is ziplock bags are permeable to water and will gradually “leak” water in. If you aren’t monitoring humidity in the bags, what is the humidity in your AMS (assuming you use them)?
And the skull print has printed fine before without these issues? And it’s the same filament that printed fine before that’s now printing with artifacts?
Thanks for the response.
I’ve not been monitoring the humidity in the vacuum zip lock bags, but all these rolls are less than 1 month old and all from Bambu Lab. The P1S and AMS are less than a month old as well.
The humidity in the AMS is always below 20% and often below 10% as reported by the AMS itself. I use the Dry Pods and Desiccant Trays for AMS by Longracks Labs in the AMS.
I’ve printed other models with both the Black Matte and Brown Matte filament before without these diagonal lines appearing. But this is the first time print for these models with those filaments.
I think I will try just printing those two segments of the rattlesnake again, in the same position with the same brown matte filament to see if its reproducible. It’ll be a lot quicker than printing that skull out again. If it does show up again, I’ll move it around and see if it follows, or is position sensitive (possibly meaning something is binding at that position). Perhaps also try a different color matte to see if its something with that spool.
Ok, I printed just the two rattles from the snake. First print (middle rattle in photo) still had the diagonal bands, but at a much lesser degree. The second print (closest in photo) was printed in 0.16 High Quality and still showed those same diagonal lines (again, to a much lesser extent than the first print - but still there.)
So next, I moved those two rattle segments to the middle of the bed (originally at the near left corner - as facing the printer). And the bands MOVED. Now they are inside the segments.
I then dried the filament, again, 50c for 5 hours and printed the rattle segments again in the center of the bed.
I’ve been 3D printing for about 10 years now and never seen an issue like this before. While his P1S is the best quality printer I’ve owned so far, these artifacts are driving me nuts with ruining what are otherwise perfect prints.
I guess the next step is to open a ticket with Bambu Lab
I think I once had a similar problem – try changing the nozzle, it might be worn out. That helped in my case.
Bambu Tech Support responded with the following setting in their slicer:
Layer Height: 0.2mm
Wall Generator: Arachne
This cleared up the diagonal lines almost completely:
Then when I changed the layer height to 0.16 (0.16mm Optimal, still with Arachne selected), the diagonal lines (minimally) appeared, but still acceptable to me:
However, when I turned on Variable Layer Height (Adaptive 5, Smooth 1), the diagonal lines reappeared in full, but in a different location:
I’ve asked Support for additional suggestions, but in the meantime I will be printing using the following ideas to keep these defects at bay:
Now, back to printing!!!
