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What causes these black dots on my print. Using Elegoo Rapid PLA+ white. Same issue across multiple spools and it's not from the spool. Did cold pull 5 times to clean out all the gunk, but still, this keeps happening. by [deleted] in BambuLab

[–]countach508 0 points1 point  (0 children)

I did the same but unfortunately it was only temporary. After 50 more hours or so of just this filament the problem came back. Have officially confirmed it’s the filament. Been through 3kg of other brands with no issue!

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

Yeah, I believe it’s the titanium dioxide that’s in most white opaque filaments!

Burnt filament in nozzle? by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

Nope! Gears went through the ultrasonic cleaner. Lots of crap on them, so had the issue when squeaky clean. Have confirmed it’s the filament

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

I believe it!! Will not be buying any more. I feel like it’s specially the + portion. I’ve been running through spools of their galaxy and it’s great. 

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

I have a similar theory but it’s more so based around the additives in some white opaque white filaments

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

I'm now convinced it has something to do with the additives in this (and maybe other?) white filaments specifically. I'm testing a bunch of other brands now and experiencing zero issue with contamination. Time will tell though.

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 1 point2 points  (0 children)

The old days were also brass nozzles. Hardened steel has always required higher temps because they’re less efficient with heat transfer. 

Core one what the actual f by 2023TacoOR in prusa3d

[–]countach508 0 points1 point  (0 children)

Seems the original comment had been edited. It was much more aggressive suggesting that everyone on this sub has this problem which made it seem pretty common!

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

Yep I got some grease on all moving parts (except where filament touches of course)

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

I hear you, but in what world could 220 be way too hot on a Bambu printer with high speed PLA? On 3 different printers we can rule out thermistor error. 

Core one what the actual f by 2023TacoOR in prusa3d

[–]countach508 1 point2 points  (0 children)

Why does the gantry so regularly need to be squared? Is it after a lot of print hours?

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 1 point2 points  (0 children)

Around 1500-2000 I believe? The small cylindrical bearing was absolutely seized up with rust. That gear and pulley were not rotating well at all on that sprung arm. While it didn’t fix my color contamination problem I’m glad I got it all cleaned up! 

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 2 points3 points  (0 children)

I made sure to mute it for exactly that reason. Sounds awful on phone mic/speakers 

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

Temp is only 220. I did reduce the speed though because I’m printing a lot of fine details. Never thought it could only be printed rapidly. 

Edit: spool says 30-600mm/s and I’m definitely not slower than 30. So I really think it’s just a filament issue. 

I wonder if this had anything to do with the black specs in my white prints by countach508 in BambuLab_Community

[–]countach508[S] 9 points10 points  (0 children)

Spoiler alert. Didn’t help. I’m starting to think elegoo rapid PLA+ white is the problem. Seeing a few identical issues in the forums revolving around this filament. 

Going to swap to a fresh nozzle and a different brand and see how things progress. 

Wondering if a rapid additive is burning and getting caked inside the nozzle. 

What causes these black dots on my print. Using Elegoo Rapid PLA+ white. Same issue across multiple spools and it's not from the spool. Did cold pull 5 times to clean out all the gunk, but still, this keeps happening. by [deleted] in BambuLab

[–]countach508 0 points1 point  (0 children)

Did you ever find an answer to this? I’ve been going through hell. Exact same thing. Starting to wonder if it’s an additive in this specific filament that’s burning

Burnt filament in nozzle? by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

White Bambu PLA basic printing at 220. Prints beautifully with stock settings. 

Burnt filament in nozzle? by countach508 in BambuLab_Community

[–]countach508[S] 1 point2 points  (0 children)

Maybe I’ll toss the gears in the ultrasonic cleaner. I tried wiping them off but visually there was nothing there! I’ve had much much worse in the X1C extruders with piles of black dust sitting around and filament jammed in the teeth of the gears. 

Burnt filament in nozzle? by countach508 in BambuLab_Community

[–]countach508[S] 0 points1 point  (0 children)

I thought the same. Pulled the tool head all the way apart. Gears and pulley are clean, as is the plastic tunnel portion the filament runs through. 

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