Closing an open polysurface

hi there. i am struggling with this open polysurface, i can’t seem to get it closed. the intention is a proper stl file ready for printingopen plsrf.3dm (267.3 KB)

You can simply use _Cap command.

i can’t believe it actually worked… thank you!

Closing an open polysurface.3dm (189.7 KB)

The most efficient way could be something like this:

Soridum.3dm (169.5 KB)

stl.stl (5.3 MB)