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Weird Underextrusion (lemmy.world)

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

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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] 2 points 4 months ago (1 children)

You said that you can place the part on different locations in your bed and get the same results? That's interesting.

How clean is your PEI? Dish soap, a new sponge, and paper towel is a good cleaning method.

Have you done a basic tuning cycle? What's your temp setup and extrusion multiplier?

[–] [email protected] 2 points 4 months ago

I've tried it on a textured PEI (ASA) sheet in multiple spots, and a smooth PEO (PLA) sheet, same results. It's always the same size and orientation, thought the PLA one was a lot harder to see.

The plate isn't that clean, and I've used a lot of 3DLAC on it. I'll likely try cleaning it again soon out of desperation, but I can't see it being likely to change anything.

I've tuned basically everything, and changing my pressure advance value made no difference. 105 bed, 245 hot end for ASA. 60/220 for PLA.