3d print output problem, cross setion optimalization

Hello Karamba,

My problem is that I creat a sctructure and run the cross setion optimalization. I need to print the result out but the final meshes in karamba are open tubes. So somehow I need to connect them at he nodes to get a fully closed structure. 

Do you have any ideas how I can manage it? What is the way how you can get printable models from karamba?

Thank you!