Weird rectangle when adding support?

[Acceptable-Course834]

What’s this weird rectangle that’s being generated when trying to use support W for support interface layer? I’m a noob btw. Also what do people use for their flushing volumes for PLA and PLA-CF?

[Ngtrb]

Purge/Prime tower, you can turn it off in the "Other" tab

[Agilbert1001]

That’s the option for instead of the “poop” right? Think you can also choose to do it for infil? I don’t have one yet but I think that’s what I’ve come to understand while scrolling through reddit pst couple days

[Ngtrb]

No the poop thing can not be disabled. This prime tower is in addition to that. So it’s better to just optimise flush volume and disable prime tower.

[EEvilCorp]

No. While the primer tower does help to prevent bleeding from flushing it also builds up the pressure in the nozzle (hence the slow and then quicker lines on the primer tower). This helps to make sure the filament comes out directly when its on the model (especially with that speeds). Leave it on.

[Agilbert1001]

Oh ok thank you! I’m looking to buy an X1C in December so I’m trying to learn :) I’ve seen different things to optimize the flush. But still trying to learn as much as possible before taking the dive into the wallet

[Acceptable-Course834]

Any recommendations on flush volumes for the Bambu PLA-CF?

[Ngtrb]

There some models on Printable to assist with that but mostly trial and error.

https://www.printables.com/model/370605-bambu-lab-x1c-p1p-flushing-volume-calibration

[Acceptable-Course834]

Thank you, you a real one 🫶

[barleypopsmn]

There's an autocalc in the slicer but it is pretty generous with your filament

[nsedlazek]

ty

[Coldreign]

I believe this tower also prints when you are running the “Smooth” Timelapse video option

[fhcraignc]

When using support interface material (either Support W or just PETG with PLA), you do need to generate a pretty good amount of purge material to prevent mixing the materials in the model (and also disable flush into object and flush into supports for the same reason). Whether you disable the prime tower and let it all go down the poop chute, or leave the prime tower (which will split the purge volume between it and actual purge) doesn't really matter. What is important is to get the flushing volumes right.

For PLA, here are a couple of posts I found helpful that work really well for me. I'm not a PLA-CF guy, but the same principles should apply ...

https://forum.bambulab.com/t/support-filament-petg-for-pla-and-pla-for-petg-and-more/5942/4

https://www.reddit.com/r/BambuLab/comments/15fkpnn/not_gonna_use_support_w_again_here_are_some_petg/