Layer Separation On Corner Above Support

[TinkerP29]

Hi All,

I am using a P1S with a 0.4mm nozzle and Bambu PETG-HF filament. I’m feeding from an AMS with an internal relative humidity of 11%. Printing at 0.2mm layer height. I am running into an issue with a print.

The print has an overhang that requires support. Where the print transitions above the support, there is always a small gap between layers on the same corner. Any thoughts on why this might be happening and how to fix it? I use BambuSlicer exclusively.

Here is a list of things I’ve tried so far:

1. Support using the standard BambuSlicer settings; using a raft interface of PLA and z distance of 0 between support and object; and using no interface material, but a lower z distance of 0.2 and an upper z distance of 0 (The support stuck and the gap remained).
2. Changing the wall loop numbers
3. Changing the wall loop speed. I currently have it at 50mm/s.
4. Changing filament types.
5. Adding seams to force the nozzle to start and stop in a different location.
6. Calibrating the machine.
7. Rotating the print on the print plate.
8. Classic Wall Generator and Arachne
9. Changing the infill density

I am at a loss about what to try next. Has anyone else experienced this? What did you do to resolve it?

Thanks!

[Bullocks]

It would be good to see what the goal is. That shelf part of the model? Screenshot of the slicer view of the models print orientation, and the slicer view showing where the supports are attached, please. And/or 3mf

[TinkerP29]

The goal is to have good layer adhesion at the transition from overhang to the main body of the model. The issue seems to be caused by the direction of the head path. Bambu Slicer wants it to go counter-clockwise, which causes it to turn the corner out in space and then return to the main body. On the other end of the model, the head path goes from the main body out to the corner. The layer adhesion is good there.

Attached are some screen shots and the m3f file.

Thanks!

CornerTest.3mf (74.2 KB)