Fillet Edge problem

[kedzior.kamil]

Hi…how to do it correctly to have fillet in the corners? After FilletEdge command with radius 2mm Im getting this crap

[davidcockey]

Upload a .3dm file with a sample of the geometry. Drag the file to where you type a post or click on the vertical arrow icon above where you type a post.

How do you expect this fillet should end?

[theoutside (Kyle Houchens)]

see this video-

Rhino 7 - Pipe trim trick

[kedzior.kamil]

thanks