Hi Steve, or actually since in this case some areas were able to get mitered even though they're on 3D curves, take one of the pieces that was successfully constructed, like this one here:



and then delete all the other ones to its left and right and then you can probably replicate that good one around with Transform > Array > Circular.

- Michael

Hi Steve - also if you zoom in a ways on the seam areas of where the 2 tubes cross each other you can see why it's difficult for these kinds of things to get auto mitered:





You can see that there's a rotational difference between the 2 shapes there, the rotation would be a lot more obvious on something that wasn't a circular shape.

In some areas that rotational difference was small enough that it was ok, but in the ones that failed it happened to be a bit larger and if it's too large it significantly complicates the miter trimming mechanism. The mitering can only work if the surface pieces meet up in a more precise way, so usually it only works if the paths are 2D curves.

In the future I do want to add in a different corner mitering style which would to put in a slanted profile and then sweep to that slanted profile rather than doing an extension and trim type method, but sweeping to a slanted profile produces a slightly different kind of shape. You may need to do a manual slanted profile approach to make stuff like this work now though.

- Michael

Thanks Michael.
been playing around a bit with sizes, found if I get the right combination of sweep profile and sphere size, it would sweep OK :)