Overhang Layer Above Interface Layer

Bambu Lab Software Bambu Studio
1

Hi all,

I have a H2D and am printing a model with ABS and using BBL ABS Support for the interface layers. I’ve not been completely happy with the model’s supported surface quality so I started digging deeper into the slicing results.

What’s I’ve noticed is that for every supported surface Studio inserts an empty (overhang wall?) layer between the top most interface layer and the model. The images attached show the uppermost support interface layer (Layer 1) then the next missing(?) layer with the overhang (Layer 2) then the next layer of the model (Layer 3).

This to me seems like setting a 0.2mm Z gap distance if you weren’t using interface filament. My top Z is definitely set to zero and the model surface is flat. Does anyone know why Studio does this and how to resolve it?

Layer 1
Layer 11213×712 328 KB

Layer 2
Layer 21226×694 334 KB

Layer 3
Layer 31227×706 334 KB

2

It might think that bridge is fine to print unsupported depending on a lot of settings. A thread like this is gonna be powered on vibes alone unless you include the 3mf of what is trying to be printed

Try painting that span specifically with the support painting tool, same result?

Also can try the various autogenerated types of support (tree hybrid, tree strong, organic, etc) to see if any one interprets it better