Extruded cut feature and unwanted web wall

Extruded cut feature and unwanted web wall

Creating ring
- Revolve solid to create the ring
- Revolve cut to create grooves inside the ring
- Round to create rounds inside corners of the ring
- Chamfers
- Extrude cut to create holes
- Extrude cut to cut wall between grooves - the result are cut and thin wall inside the ring.

Finally after restructuring features in model tree, the strange wall automatically disappears.