Closing an unusual surface edge

looking for some help/pointer(s) closing an object with complex edge surfaces. starting with a water tight object, I “milled” a slot in the object’s model leaving a “naked closed edge”. haven’t not found a “close it” tool! a surface patch from 4 edges looks promising but don’t know how to extract the “curve” from the surface model which is a must given its non-standard form……. any help or thoughts on how to proceed would be greatly appreciated!!

Art Smith

elliptical intake horn for Weber 32-36.3dm (306.3 KB)

use the red curve
_extrudeCrv
with direction option

you will get the violet surface

trim and join

or faster
_createSolid

elliptical intake horn for Weber 32-36_tp.3dm (3.4 MB)

by the way:
i strongly recommend not to use spaces in file names:

bad:
my nice file.3dm
better:
my_nice_file.3dm
or
MyNiceFile.3dm

HUGE thanks!! never occurred to me and it should have…..

Art Smith