Hi OSTexo,

> I'm getting a sort of unusual split in the middle of the blend where it looks like
> the curve direction changes and folds over on itself. Interestingly this also seems
> to happen when I just try to blend a section of the junction.

Sounds similar to what I'm getting also - is this with "Planar sections" being used?

Can you please post the 3DM file of your current blend so I can test with it over here also?

Thanks, - Michael