A very kind person, I got lot of help from him.
Thank you and hope you always well, @wandererfan.
I simplified OP's model,even removed a tiny edge (about 80um long.)freecad-heini-1 wrote: ↑Mon Jun 29, 2020 12:13 pmhttps://forum.freecadweb.org/viewtopic. ... 42#p412442
So simple just impossible. Thank you.
Quite same feeling, thank you.