21

I‘ve set part cooling fan at 0% during the first layer. Should I increase to 10-20%? For the first layer and 100% from second layer up?

22

By the look of the first layer, yeah, 10 - 20% would be good. You could also try to slow down the first layer. And make sure you clean the build plate with warm water and soap once in a while. IPA is good for in-between prints, but at some point, it’s only spreading the debris on the plate.

23

It’s in bambu slicer too. Then the print.

IMG_0376
IMG_03761170×1544 350 KB

24

That is weird. To me, It looks like were the nozzle enters to print the layers… Could you see what it does on the bambu slicer by playing it to see what that would be on each layer?

25

Did you not read his post?. He used a brass brush on it plus did a cold filament pull.

26

You clearly have no clue what you are talking about and did not use a Bambu Lab printer. There can always be some filament that accumulates during purging, or while printing other areas.

27

I know exactly what I am talking about. Trust me. The squares showing up are a completely different problem that wisp. You’re excused.

28

Pretty vocal for someone who does not know how to fix his own issue.

The way that the P1 and X1 Series purge and clean their nozzles can potentially get filament stuck on them. Even if you were around for every filament change, cleaning the nozzle with your brush, there might also be a significant amount of oozing resulting in small amounts of filament build-up on your nozzle.
This nozzle-cleaning procedure of the X1 and P1 Series is different from what you know from your A1.

Before you respond, I suggest you read the whole thread. Making an unrelated comment three months after the issue was fixed is kinda silly.

P.S. You have some under-extrusion on the black parts of your print.

1 Like
29

Came across this post since I was having the same issue myself;

In my case, it turns out to be caused by a failed print job using black earlier, where it had a big blob of filament stuck at the bottom of the nozzle. I had pulled it off and thought it was OK again afterwards, but it seems like there was a bunch more filament globbed up inside the rubber nozzle cover itself.

With the nozzle heating up again, it would some times ooze out and shed tiny bits which would leak onto my new print and get embedded in it.

to fix, I removed the robber nozzle cover, retracted the filament, and heated up the nozzle to 270F. the black filament stuck on the outside then softened up and could be wiped away, resulting in clean prints afterwards again.

2 Likes
30

Use cleaning filament and the problem is gone…

https://www.amazon.de/eSUN-CLEANING-Reinigung-Vakuumverpackung-Natürlich/dp/B07FQ46L1L/ref=asc_df_B07FQ46L1L/?tag=googshopde-21&linkCode=df0&hvadid=696321262694&hvpos=&hvnetw=g&hvrand=2547711724640073751&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9114041&hvtargid=pla-601279224658&psc=1&mcid=59d74098968a3ec6933908b9d62576d3&th=1&psc=1&gad_source=1

31

For what it’s worth, a cleaning filament could only clean whatever is gunked up on the inside of the nozzle, not ■■■■ stuck to the outside which is what caused the issue for me.

32

You’re only guessing. We need facts. People who have solved this. My guess from everyone guess would be high flow rate. Then z hop not high enough. I printed 7 plates making changes. I finally got a good one. Mentioning the above. Lower flow. Lower temp. Raise z hop

33

For whatever it’s worth, I have had issues with little wisps of black getting caught in the lighter colors and marring prints.

I keep a can of Dust Off next to the printer to blow any wisps of filament off the print between colors on critical prints.

I absolutely cannot advise this to others but while the filament is purging between colors, I shine a flashlight at low angle across the print to spot any hairs stuck to the print and give them a quick brush with my hand and then a blow with the Dust Off. But I also make sure my hand comes out when the extruder fan spins up to prepare for the nozzle wipe.

1 Like
34

This is caused by dust that builds up on the belts and carbon rods dropping onto the print.

Resolve this issue by wiping down all of the belts and the carbon rods with a microfiber cloth with some isopropyl alcohol sprayed on it. I did this on all 5 of my P1S that were having this issue and it has resolved it on all of them. Do NOT use a paper towel or it will leave paper residue on all the belts.

I am posting this in this old topic because I was looking everywhere for a solution to this problem and did not find a definitive answer anywhere.

35

Having the same issue. Happening across multiple spools of Elegoo Rapid PLA+ White. The spools themselves look fine with my naked eyes. Doesn’t seem to happen if I use Bambu Basic white.

I’ve already tried:

36

For me it’s 100% from the hotend itself, as I was watching it closely during the print. It’s not from the belt or anywhere else.