OrcaSlicer creates support interface in mid-air on top of model
I'm having an issue with OrcaSlicer on my Snapmaker U1 while trying to use PETG as a support interface layer for a PLA print. Normal supports originating directly from the build plate work completely fine. However, any support structure generated on top of the model surface fails.
Specifically, OrcaSlicer generates the first support layer directly on top of the model using PETG, but leaves an unwanted gap between the PLA model surface and that PETG layer. Then, it creates another gap between that PETG layer and the PLA support structure on top of it. Because the PETG interface layer starts in mid-air, the entire support structure fails to adhere and collapses.
I know I could use Tree Supports set to "Support on build plate only" to avoid printing supports on top of the model, but Tree Supports triple my print time. Since I need to batch-print this model, that isn't a viable option for me. I was thinking about using a combination of Normal and Tree supports so that areas without direct access to the build plate use Tree supports (even if it adds some print time), while the rest uses fast Normal supports.
Has anyone encountered this mid-air PETG gap issue, and is there a specific setting to fix it? Alternatively, what is the best way to set up a hybrid Normal/Tree support structure in OrcaSlicer?
Thanks for any help!