Weird Bubbling

[colin]

I started printing a larger print and on the bottom layer I got this very odd bubbling in two different spots on the print. I am using Ultimachine PLA at 220C (new hot end). Any ideas what might be causing this? Has anyone encountered this before?

[jsc]

That's pretty strange. Is the filament steaming when it extrudes? Maybe it absorbed moisture.

[ednisley]

very odd bubbling

That looks like a a patch where the filament hasn't adhered to the platform: it curls slightly, rather than laying flat, so adjacent threads join together and look like bubbles. The patch is small enough that the threads can bridge the gap; if it were any larger, they'd peel off and wreck the print.

Perhaps a finger smudge?

[jimc]

before i read ed's response thats exactly what i was thinking....something was on the glass and it didnt stick in that area

[colin]

Thanks for all of your responses. The consensus seems to be that its just a matter of the filament not sticking in that spot. I was worried it might be something in the settings or mechanical. I'll put on a fresh coat of hairspray and try again.

[rrohret]

I have had the same issue on a large, flat print. I have only had the M2 for 4 weeks so I am new at this. It looked exactly the same. I was able to get past it but I suppose it was non-sticking areas.

[Tim]

I got something that looked almost exactly like that once before I started using hairspray. I got a thumbprint in the middle of the glass, and the PLA just wouldn't stick to it there. But I had a similar problem on my most recent print, seemed to have something to do with the fact that it was a new roll of filament. I should have checked the first bit of filament for imperfections, although the root cause could be any one of several possibilities I can think of. It worked itself out after half a minute, and was smooth as can be for the rest of the print. But it's surprising how a surface imperfection like that can keep impacting the layers above it. The plastic is warped, and it will stay warped, layer after layer.