Hi Randy, yeah Trim was very finicky on this object, I think that some of the edge curves meet each other or the surface by a slightly looser tolerance than what MoI is expecting. Either that or the narrow spacing of the outer boundary away from the underlying surface boundary is problematic.

I was able to get it to trim by using the "Isoparm" option of the Trim command to first slice off the narrow strips and then further trim it using the curves. So it took some fiddling and also I had to scale it down by 1/10 in size in order to join it and then scale back up again, my guess is it's probably built to a tolerance of 0.01 units rather than the 0.001 units that MoI more generally expects. For trying to re-use the same curves for a new trim that difference in original construction tolerance gets to be problematic.

Anyway the result I got is attached, hope this helps!

- Michael