raidho36 wrote: ↑
Sun Jun 07, 2020 10:52 pm
Finally, I've tried making lofts one per body and join them using boolean operations, but those either fail completely or produce invalid results.
Tiny intersected details prevent boolean operation success. (red-marked) The reason is same as @chrisb called "co-planar" issue.
I tried export your model as STEP and OBJ, and tried union them in another CAD, suface modeling app, Blender, all resulted in failure.
So my feeling is that, "co-planar" and similar issues are not FreeCAD only, but related to all Boolean/CSG workflow in all 3D apps.
My workaround is cut the "neck" off. Rebuild neck with loft. Then reunion them together.