Weird Underextrusion

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?

imgur.com/a/ggaZDMY

tristan,

I hope you can work this out because I’m having a similar issue with my new voron 2.4 build… Though mine isn’t a kit and is using a dragon hotend

I’ve kinda had to put it on hold due to health but I plan on trying to diagnose it more when I get some good health days

wccrawford,

I posted in another community on Lemmy and got some suggestions, but the only that that’s make a different so far is printing a lot slower. That decreased the underextrusion area to about half, but it’s still there and very obvious on ASA.

I’m leaning towards a bad extruder (or at least bad gears), but they’re BMG and I don’t feel like they’ve had that much usage yet. I might take the opportunity to replace it with a Galileo 2 and see what happens.

If I end up figuring this out, I’ll come back and reply again.

IMALlama,

Fellow 2.4 person whose also chiming in on the thread in the lemmy.world instance of this community. My 2.4 doesn’t do this, but it could potentially be klipper related (pressure advance, input shaping, etc).

wccrawford,

I finally solved it. Voron KAMP’s Voron Purge technique puts little blobs of filament on the bed. I also have Voron Tap. My tool head was hitting those blobs and moving upwards slightly, causing the extruder not to squish the filament into the bed in the same pattern as the voron logo from the purge.

My solution was to initially to move the purge further way, but that kills large parts of my bed usage. So I just wrote my own purge line script and I’m using that now.

I hope this helps you solve your problem!

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