Note I imported the SMT file.
Unfortunately it still appears to have the same problem.
The required body split is on a plane created with zero offset to the horizontal surface that you have split the body a few mills off.
Try this on your "fixed" part.
Join the bodies back together.
Create a plane on he face with the hole in leading up to the angled face.
Now try and split on this plane. I get...
Error: coincident face_face_ints with different body vertices
Sorry, my bad - I should have mentioned about the .zip extension. It's just a different name than .f3d (to make uploading to this thread a success).
Looks like the part got scaled (without healing). Please try this attached part (the zip file has the ".smt" file which can directly be opened from Fusion 360) and let me know.
We will take a look at the part creation workflow since its important to understand how we got here.
Note that the forums may support native .f3d attachment now.
I had the same problem in having to zip f3d files on this forum which seemed poor considering the subject matter.
Recently I have not had to do this, so maybe that was addressed?
Of course if you tried it on this cycle, then you will know definatively already.
Just worth mentioning.
Thats great, I appear to be able to split that body where required. I will attempt to combine with the overall design tonight and work it forward, then confirm if I can recreate a transition from a working to non working component in isolation, package it and provide for consumption.
If you can isolate the steps to create the bad component that would really help us. Like I said before, we will explore the workflow details mentioned before by you.
Yes, I have seen f3d files uploaded and thought we were pass this, but I had problems doing it yesterday. I will check internal with some folks.