Yesterday, in doing some tests on something else, I notice that Join got more intelligent when joining a series of co linear segments… (Random color applied on joined objects in V5 and V6)
Rhino now figures out which adjacent segments are co-linear and joins them in priority, resulting in a much cleaner, more logical result.
While this is not an earth-shaking development, it is certainly worth a 
Thanks!
AutoJoin-V5-V6.3dm (415.5 KB)
–Mitch