A curve on a cylinder may be unwrapped, or unwound, with the _UnwrapCylCurve script.
Documentation and description is contained in the script .js and in the .txt files.
Three test files are in the Test3dmFiles zip, including "un" FLOW of intersecting cylinder, which is very close to the unwrapped intersection.
- Brian

Script deleted 4/14/2017
It works well for certain curves, but needs more work for non-helical, doubling back direction curves...
I may post it again after some changes. (Only 3 downloads.)