'Morning Tom! Just goofing around. My license server seems to be FUBAR'd so I can't even get in to look at it right now. I'm sure it's just the bend being too sharp in those locations for the diameter of the tube.
That took me all of 5 minutes based on the trajectory I already had. I just threw something together. Most of what I do now is based on simple shapes (planar, developable). Gotta do something to have a little fun!