Open curves reading as closed curves making them unjoinable

I was super confused as to why my curves wouldn’t join, but I realised they’re reading as closed curves when they look and act like open curves. I’ve included a file to show what I mean.
Artemis.3dm (903.7 KB)
Thanks for any help :slight_smile:

This is typical when you have duplicate curves and you choose Join - a curve will join to its exact duplicate, making it closed (even though visually it appears to be open). Use _Explode on your curves, then _SelDup and you will find all the dupes.

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