Troubleshooting thoughts are solicited and welcome! Repeating the printing of the same file at the console produces about 1mm of a poorly formed group of layers at different z-positions. Nothing changed from first print to second print. Happens on different files and many of the print jobs result…

did you check this print for dimensional accuracy on the Z axis? it looks very similar to some prints i have seen when the Z driver overheats and stops moving up. so it prints multiple layers at the same height. you will know that is the case if the height of your print is not what it should be.

@Atom . Interesting thought! It does look somewhat like the layer has been “smeared” by the nozzle dragging over it. The overall height measure OK (slightly less height by the same ratio of length measurement to the CAD file dimensions). I would expect the Z axis to be the last to overheat as the…

What a fascinating issue to be having. If my own experiences say anything, I wonder if you have any loose axis which is sometimes for one reason or another more pronounced than others, but… why would it be the same thickness if that were the case.

@MooseJuice (interesting handle BTW), Yes, it is almost as if the layer is being repeated causing the significant smearing effect. I can find no loose mechanical aspect and the motion sounds are OK (except when the nozzle is dragging around an apparently existing layer. I’ve submitted this issue …

I agree this is a interesting issue. Have you observed the printer while it is printing the layers in question? If not I would try to get it on camera, could be a shake or a wobble maybe. Also what filament are you using? Is it possible that there are bad sections of filament in the roll?

@Atom , the issue is evident with both the Snapmaker provided filament and good quality HTPLA fresh filament from Pasta Proto. I can observe the issue and it appears the comment on “smearing” over a just printed layer is accurate. I think I can hear and observe the nozzle dragging over existing la…

What about noise? Do you hear a grinding or clicking sounds particularly between layers? Also are these prints measuring the same hight across the print? Could it be that your z hight is getting out of sync at that point in the print and causing the issue?

Simply cut the models in half and take the good top part and glue it to the good bottom part. EZ I kid, I kid… Hard to tell from the pictures but @jmeckstroth , is this limited to the outer perimeter only? No roughness on the inside? And I can’t 100% tell, was there a layer shift, or is this sudde…

@brent113 , thanks for jumping into issue! Snapmaker support is backlogged. What I am now convinced is that the issue is most likely “smearing”, which appears over the entire layer. On the same part, it can occur on layers with fill (15-20%) or full layers. There is not apparent X or Y shift duri…

Hey what if the nozzle temperature is fluxuating for some reason? Or the sensor which provides the reading?

1+mm bad 3D printed layers in random location

Snapmaker 2.0 (3-in-1)

brent113 November 5, 2020, 10:49pm 13

@atom and everyone else too - could this be explained by the uneven leadscrew pitch issue? From another thread:

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1+mm bad 3D printed layers in random location

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