Strange uneven pattern on the 1st layer

[shurik 87]

Well, one picture worthy 1000 words:

PLA, recently installed Olsson's 0.4 nozzle.

Pay the attention to the rough and uneven layering everywhere.

Why? What can be done to fix that?

[Labern 774]

Looks like it's a bit over extruded. Have you tried lowering the glass a bit?

[DidierKlein 729]

The round shapes are strange... i saw some uneven build plates that could do this. Maybe your plate is slightly too close.

What's the first layer height? I recommend staying with 0.3mm for the first one

[shurik 87]

Hi guys,

Yes, the 1st layer is the standard 0.3mm.

What are these round circles? The buildplate cannot be lowered or raised, as it will worsen either the round-circled "flower" or the rest of the plate.

What a nasty puzzle...

[Labern 774]

Oh i thought they were just a reflection. I guess its just uneven glass. Have you tried flipping the glass over and printing on the other side?

[DidierKlein 729]

I'm pretty sure i've seen something similar on the forum (it was a picture with a camera that takes pictures of heated areas).

It almost looks like the build plate is not even at certain spots, or maybe it comes from the rods that are slighlty bent?

Can you try maybe to flip the build plate on the other side?

[shurik 87]

Thanks guys, will try to flip the glass although it is unlikely the source of the problem. It used to be good, except some slight tilt to the far-right corner, but this is how the printer originally came. More or less, all the sudden, there is this strange pattern. Most probably, it comes from the rods or the belts but at the moment, have no idea where to start looking at.

[neotko 1,417]

Just in case. Check the screws are 'in' and they don't hit the glass

https://ultimaker.com/en/community/view/10335-glass-plate-not-flat#reply-115423

[IRobertI 520]

I would take a close look at the rods and see if they wobble. See if the patterns match up with full rotations of the pulleys.