Hi,

I tryed to do like NAMELESS.
You're right, I think it's the number of point due to too many points on edges due to the multiples trimming, smoothing, joining...

I tested a fixing.
I took the two circles edges on top and the two bottom edges (copy/paste them) and delete the solid.
For this edges, I joined the segments to have closed curves and reconstructed (Rebuild or ReconstructCurve) those curves (exemple 200 points).

Lofting big circle with its bottom curve. (don't close the loft but do a plan with big circle)
Lofting small circle with its bottom curve. (don't close the loft but do a plan with small circle)

You can do a sweep with the two bottom curves as two rails for a profil done with a curve between this two rails.

Join all surfaces gave you the solid. This one accepts to be fileted on bottom extern edges.


I don't know if it's the best way to do it, but it's one way.

Try it, if you want...




Regards

FR.