Very weird intersection/mutual trim between two surfaces

Anyone know what’s going on here?

Doesn’t seem to matter if I increase the tolerance of the file either…

(It was originally an offset with solid=yes that produced a very poor result that I’m trying to fix.)

weird-intersection.3dm (242.3 KB)

Here’s another one (originally same part as above, just different place):

That’s obviously not their intersection, but again, increasing the tolerance doesn’t seem to help.

weird-intersection2.3dm (248.5 KB)

Hi @eobet
Something went wrong with the trim curves during that offset, which of course shouldn’t happen. If you use the What command, you can see that the tolerances for eg. the edges on the blue surface is 0.001 to 0.861. Use RebuildEdges to fix it.
HTH, Jakob