Please find attached a file (KleinTeil) of an object which I tried to fillet, first as a solid, then surfaces, then edge(s). I tried various options: circular,… but without success.
However I was able to shell this object.
Unfortunately the sharp edges cause problems with 3D-printing.
Is there something I could do to fillet this Object?

I have then 'rounded' the object (see file KleinTeilRounded) which I tried to shell with a thickness of 2 mm.
The calculation started but stopped without producing the shell.
I tried different thicknesses with the same outcome.
Is there some other possibility for creating the shell, which I would like to 3D-print?

thanks & regards
Jurgen