Not sure how feasible this is, nor if there’s a better way to do it.
From Rhino I would like to export a number of meshes as STL - say, a collection of rings in different sizes. Easy enough, select then export. Each object then is stored as a separate mesh within the STL.
Then import them into Preform and be able to select each ring separately for layout, orientation and support generation rather than selecting the entire loaded STL file and all operations act on all the meshes.
Current alternatives as I see it are a) export each ring as a separate STL, which is both time consuming & messy or b) do the layout & build the whole support structure in Rhino and export that as STL (which loses most of the benefits of Preform).