Hi,
I am tring so hard to solve this problem, even using Autodesk Shape modeling multiblend didn’t do the trick.
As you can see in the picture, there is a portion of a model I am working on right now. It is a pipe that splits in 3 pieces. I need to close smoothly the gap created by this.
did anyone had this issue before? how did you solve it?
i annex the model, hope it helps 
triple.3dm (677.1 KB)
my best attempt has been to sweep up to the center and then patch the edges together… the results is very far from what i need to obtain, but it might inspire alt. solution
I have a few problem’s like you have, and i use a few commands and various sweep’s.
I try to do the biggest part of the geometry with sweep 2, but after that i have to use a few different commands like:
See this tutorials:
I followed this tutorial and made some progress.
as the tutorial does, I basically sweep two portion of aeach arc and then patch the Y-shaped opening.
This way I obtained a closed pol-isurface (in the picture just the portion of interest), still the surfaces are very far from being nice and smooth 
I’d rebuild some of the geometry you’re working with (if it’s not essential for the internal surfaces to be exact)
It’s not perfect, I didn’t spend an awful lot of time on it.
If you look at it from the right hand side you can see that I exploded it and then extended the surfaces and trimmed them all level with a curve and worked on it from there.
There was a lot of split edge and blend surface action to quickly knock it out so you have something to work with if you want to try and do it yourself.
http://screencast-o-matic.com/watch/cD6t6xjm5u
Andy
Example_01.3dm (1.1 MB)
Now, if you want to improve your work try to:
