Hello,

I am trying to thicken a surface but it fails.

When analyzing the geometry, it tells me that the minimum radius of curvature is 0.12mm at the yellow arrow, but I don't understand why. Is it why the thickening fails ? I can only thicken to the outside, but when the inside it fails.
My surface has been done using Boundary Surface, everything has tangency... 
The error only happens after the "Trim Surface" feature. Before everything works well.
You will find the part file attached.

Thank you for your help.

Best regards,

Anselme