Hi Art,

> Furthermore the merge command does not appear to work as expected all the time. On one
> side of the model I am able to merge a split arc edge curve into one clean one. On the other side
> I am unable to perform merge and my arc stays split into two parts because of that other existing
> seam. Why would only one side of my model produce this vertical seam after performing a mirror
> whereas the other side does not?

Can you please post the .3dm model file with the edges you are referring to here that won't merge?


> If I mirrored and boolean union both halfs, the seam should go away?

Currently boolean union can remove edges in the combined object in 2 cases - when they are planes that are coplanar, and when the 2 faces have the same full underlying surface.

It doesn't currently know how to combine 2 side-by-side extrusions into one extrusion but that is something that I want to add.

- Michael