Hi Carlos, MoI does not have any built in mechanism to remove duplicate curves, but Rhino does so you could use Rhino in a situation like this to help out. You would want to bring your 3DM file into Rhino, then run the "SelDup" command in Rhino, that will select duplicate objects which you can then delete.

How is it that you're getting the duplicates in the first place, is it from some accidental copy and pastes or something other than that?

- Michael