Extrude - Nesting Faces The feature contains nesting faces or internal loops. Try recognizing the faces separately. The selected faces have multiple possible combinations of sketches, and therefore multiple possible extrudes. Example Parent topicBoss and Cut Extrudes Extrude - Non-Planar Face Extrude - Non-Parallel Faces Extrude - Non-Coplanar Faces Extrude - Self-Intersecting Sketch Extrude - Internal Loops Extrude - Invalid Edge Extrude - General Failure