Hi Margaux - yeah… that is because the flowed object does not meet its self cleanly where is wraps around - I’ll see if I can make it work - there are two problems, I think - one is, along the curvy edge, the ends are not tangent where they wrap around to meet each other. The other is on flowing there is no good way to accurately maintain that tangency even if it is there to start with - it is fixable in a geeky sort of way - hold on a bit and I’ll post a file.
OK, so it looks like we can skip the geeky bit and just make the edges tangent - see the attached file -
At step 1 the red and blue curves are not tangent to each other - that means that when the edge of the solid version of this same shape will not be tangent to itself when it wraps around.
At step 2 I’ve used
match for tangency on the two curves, Blue to red. So Blue is now tangent to its other end, so to speak.
Then when the thing is extruded and flowed, it meets cleanly where it wraps around and the fillet can handle it. Note step 5- I’ve extracted the end caps of the wrapped shape and then deleted them - these are internal to the solid and not needed.
Flow, with the Line option and Stretch=Yes and not
Flow Along Surface Mystery_PG.3dm (208.6 KB)