Can't join

Hi, I managed to fillet this surface but I can’t join the filleted edge to the extrusion. Why not? Please help!verbena earring.3dm (3.3 MB)

Hi Susan.
If the main polyline is to remain the one you have drawn (which has continuity zones G0),
instead of the extrusion command, I copied the main curve and connected to the primary with an intermediate perpendicular curve. Then I used the sweep 2 rail command and the fillet command. Maybe it helps.
verbena earring.3dm (3.2 MB)


I’d just rebuild the shape curves as a single curve. To clean up all the continuity breaks. Then you can use Insert kink to add the break. A form this simple should always fillet automatically.