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?
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.
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?
Did you not read his post?. He used a brass brush on it plus did a cold filament pull.
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.
I know exactly what I am talking about. Trust me. The squares showing up are a completely different problem that wisp. You’re excused.
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.
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.
Use cleaning filament and the problem is gone…
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.
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
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.
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.
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:
- Cold pull 5 times to clean off the gunk
- Thoroughly clean build plate. Happening on both SuperTack and Textured
- It’s not from the belt or anywhere else. It’s coming from inside the nozzle as I was watching it closely during the print and could see the black deposit was coming off the nozzle
- Tried lowering the temperature of first layer to 200C (from 220C) but didn’t make any difference.
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.
In case anyone is still reading through this I have always just assumed it was burned PTFE specs that have fallen from the glass top where the extruder PTFE tube is always rubbing.
That being said, others have pointed out that it is debris from the carbon rods or XY belt which could also be true. The problem went away each time I cleaned the PTFE specs off the glass but I have never not also cleaned the rods while cleaning the glass so I could be attributing the problem incorrectly.
I’m having this issue right now. I’m trying to solve it cleaning the nozzle with more temp (280°C) and using the needle after extruding some filament. In my case, I’m using PETG. I’ll do some tests now.
This seems to be a problem with Elegoo Rapid PLA+ white. I’ve since switched to eSun PLA+ and haven’t had this issue.
I’ve also dedicated a printer just for white and this has pretty much eliminated the problem entirely.
One tip if you have to switch from black to white is first heat up the nozzle, then wipe the tip clean with IPA. Then perform a few cold pulls. Finally, print a flat 0.2mm thick sheet on the build plate to clean off any remaining residue.
The best solution is to dedicate a printer for white.
always ensure your hotend is on correctly and you didn’t accidentally select the wrong type of build plate.
the hotend even being off by a little bit can cause it to bump/rub/scrape up against your print which can deposit burnt filament while selecting the wrong plate can cause it to miss/scrape as it tries to compensate for - say - the texture on a textured plate or to be too close/too far to a smooth one.
as for the inside of the extruder/hotend: just get some cleaning filament (aka clear nylon) and do a couple cold pulls. i do multi-colour prints all the time and rarely (if ever) encounter the blobs and i use the crappiest temu-tier/aliexpress housefire special/john “amazon” bezos filament all the time.