3DPrinting

15130 readers

17 users here now

3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.

The r/functionalprint community is now located at: [email protected] or [email protected]

There are CAD communities available at: [email protected] or [email protected]

Rules

No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
Be respectful, especially when disagreeing. Everyone should feel welcome here.
No porn (NSFW prints are acceptable but must be marked NSFW)
No Ads / Spamming / Guerrilla Marketing
Do not create links to reddit
If you see an issue please flag it
No guns
No injury gore posts

If you need an easy way to host pictures, https://catbox.moe may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is ![](URL)

Moderation policy: Light, mostly invisible

founded 1 year ago

MODERATORS

[email protected]

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

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 1 points 4 months ago* (last edited 4 months ago) (2 children)

Interesting, that would confirm the pressure advance as the likely culprit (speed and acceleration are taken into account in the algo). Maybe your slicer has a bug related to this? If changing the value wildly does not improve or worsen it, then it might not be calculating what it's supposed to. Can you try another slicer?

[–] [email protected] 1 points 4 months ago

I turned pressure advance to 0 in both Orca and Klipper, and saw no difference. :(

[–] [email protected] 1 points 4 months ago

I used an older Cura that I already had installed (instead of Orca 2 that I've been using) and the underextrusion pattern is different, but still there.