"bubbles" in the first layer

[Jim]

Hi,

Have you guys seen "bubbles" like these before.  This is an established printer but this just started with recent prints.  Here are the parameters:

material: 3mm PLA

layer height 0.3mm

bed: 60C for first layer (this picture shows the first layer)  I did recently ratchet up the first layer bed temperature from 55 to 60 as I was getting some warping.

hotend: 185C

I'm printing 2 of these at once but only one of these show the bubbles.  The one on the left looks smooth.

TIA.

[Joseph]

My first guess is material issues. Did you try a different filament?

I used to see same when I still used kbell filament

[Jim]

I don't think it's the filament.  I printed 2 objects side by side and the one that started first doesn't exhibit this issue.

[John England]

Uneven bed heating? Does the bubbling always occur in the same area of the bed? Maybe hit it with an infrared thermometer.

I don't see an obvious pattern that would indicate a hardware issue, but maybe repeating the same print job and looking for similarities would provide a clue.

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[Jon Pannell]

The "bubbling" is caused by the filament not sticking and lifting. I would double check the height and clean the bed if nothing else has changed. 

-Jon

Sent from my iPhone

[Brandon Heller]

+1 - when I've seen this the culprit was an unclean bed.  Aqua Net helps avoid this problem.

[Jim]

Thanks for all the help guys.  I will check all of these things.

[Brandon Heller]

Just noticed my reply was misleading - meant to say:

+1 - when I've seen this the culprit was an unclean bed.  I clean the glass off with isopropyl alcohol beforehand and it definitely makes a difference.  Then a few sprays of Aqua Net tend to help it stay on and not ripple, as does getting the extrusion right and the extruder height right.

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