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Weird Underextrusion (lemmy.world)

submitted 4 months ago by [email protected] to c/[email protected]

23 comments fedilink hide all child comments

On the bottom of my prints, there's an area of underextrusion and I can't figure out what's causing it.

I first noticed it when I switched back to a textured PEI bed while trying to print ASA. It's on 20x20mm squares, and it's on the test print for setting up pressure advance... But only on the left-most object.

It's the same even if I add 2 lines of skirt or not. (In addition to my KAMP Voron purge.)

It happens everywhere on the bed that I've tested. It happens to PLA, but it harder to see. For ASA, it's very obvious. For PLA, it's almost as smooth as the rest of the surface, but it's there if you know what you're looking for.

I've only been printing PLA for quite a while now, so I don't know when this started.

I've got an LDO Voron 2.4 with Tap, KAMP, Revo hot end. I've calibrated pressure advanced and changed the value, and I've tried different z offsets with the textured bed, which doesn't change it. (But does change how good the rest of the bottom surface looks.)

Anyone got any ideas?

https://imgur.com/a/ggaZDMY

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[–] [email protected] 5 points 4 months ago (1 children)

It looks like it is happening in the same spot on your bed, and it looks almost like the filament is not extruded near the bed in that area.

It's is possible for you to have a cool spot in that area? It sounds silly, but do you have a dent in that area?

Does this happen if you move the print away from where the defect is happening? Try moving it in your slicer.

If it still happens in the same spot on your print, try rotating it in your slicer and see if it appears in the same spot.

[–] [email protected] 3 points 4 months ago

It's happening in multiple spots on the bed. I've tried about 6 or 7 now, and 2 different sheets. (PEO for PLA, PEI for ASA).

Rotating the square 45 degrees puts a pattern on the corner instead. It's always to the left. (To the right, when flipped upside down so I can see it.)