Hi Edwin, Flow works just on a single surface to another single surface. Your second object there is not a single surface, it's made up of 6 surfaces joined together.

So you need to make just one surface for your target object to make it behave like you want.

The easiest way to do that is probably to use the Rebuild command (http://moi3d.com/3.0/docs/moi_command_reference10.htm#rebuild) on your curve that you extruded to make that surface. Currently your curve is made up of 6 sub segments and when you extrude it you'll get one face for each curve segment.

Rebuild will make a new single segment curve and if you extrude that you should then get a single surface as the result.

- Michael