Filament not adhering correctly

[AMO_is_a_particular]

I have been running into a problem where occasionally a piece of my print will CLEANLY, and I mean VERY cleanly break at a level. I’ve noticed that it’s always where there is an overhang and I am in the process of troubleshooting if it is an issue with the support for PLA filament not being properly purged before it goes on to try and print the next layer of the part. I am using the X1C if that is of any help and my bambu studio and printer are both up to date.

I was using the basic .2 mm standard settings with the recommended setting changes for using the support for PLA filament amd I had the settings set to PLA Metal, but for whatever reason the printer defaulted to to a roll of PLA marble I had in the ABS, so I am not sure if that may contribute to the issue.
Badger Cubby 832.3mf (473.9 KB)

Ive attached two 3mf files I have noted the problem in. All of them have the issue on the layer where the overhang meets the supports so I am really leaning towards a flushing issue, but I have printed all of them with te flushing volumes auto calculated. The print I am doing now I have tripled their values and will update after the weekend, but I appreciate any tips from now until then.

Thank you and please don’t hesitate to ask for additional information!

uprightchair.gcode.3mf (1.2 MB)

[AMO_is_a_particular]

The first two pics of the dog were added by mistake

[RandomKhaos]

You have the right idea, it’s more than likely the flushing volumes. If it doesn’t properly flush out the support filament, it will create a weak layer and cause layer separation. The automatic values aren’t always the best. I typically increase my flushing between the filaments when using support material like that. Especially when using PLA as support material for PETG I’ll increase the flush by quite a bit before I quit seeing layer adhesion issues.