wow thank you for all the great suggestions. this is where I'm at

The things I'm having problems with now are:

I can't delete the small protrusion of pipe inside the large elbow. I've selected the two items and intersected them but no luck. I've tried every way I can think of to do this so I'd love some suggestions : )

I can't see an inner wall on the small pipe even though the dimensions are there. I went through these steps to make it.

-I drew a guide line on the axis I wanted.
-Drew a line long enough to have the pipe penetrate the large elbow.
-Drew two circles on the plane perpendicular to the line
-highlighted the line and extruded the inner circle
-intersected the inner wall and the large elbow then deleted the section of the large elbow that blocked the hole where the two intersected
-selected the 5mm shape in-between the two circles and extruded it.

then the inner wall dissapears.. plus i can't delete the lower section that protrudes into the elbow no matter how I intersect the peices...

Hello all, glad to have found this forum I've actually watched all the tutorials and I've downloaded skin.rb as well as pipe along path to try to make this happen.

I'm trying to build a reducing elbow with a 5mm thick wall and a small elbow. Seems I've chosen a difficult first project.

Problems I'm running into are extruding a second (outer layer): seems to not like doing a second extruded layer over a center extrusion around a bend.

Other problem is getting skin.rb to skin multiple circles together at the end of the pipe where I'm trying to reduce the elbow. I can do the first two of three cirles but the 3rd one won't connect. Seems like the problem is there are two many surfaces on the prior skinned surface...

any advice would be greatly appreciated as I've spent 3 nights so far trying to make this thing.

Cheers and thank you!