Curves into "pipes"

Hey, I am a first time rhino and grasshopper user, so apologies if this is a silly question, but I cant seem to find the answer anywhere! 

I wanted to make a voronoi on a curved surface, which I want to then pipe (and ultimately send for 3D printing for an assignment) So far, I have managed to make the curves, but i cant seem to turn them into anything 3D. 

Is there any simple way to do this? I still find alot of the technical language quite confusing, so if anyone has a simple method, it would be much appreciated! 

I've attached what I have so far. 

Thanks so much! 

Helen