Hi David, also the problem may be that your original curve is not quite 100% flat.
So for example this curve here:
If you go to the top view and zoom in to this area:
You can then see that there are some parts of the curve on slightly different levels:
That means that the extruded solids have a rather more complex intersection probably with some barely misaligned pieces than if you had a completely flat original generator piece.
You can flatten that piece by going to the top view and using the Edit frame to squish it down, there will be a "flat" snap that shows up. Seeing that flat snap is how I knew that it was not actually completely flat to begin with, because that snap is not present if it is already totally flattened.
- Michael
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