Build lip feature on multiple paths

Limit the lip extension on one of the paths to two trimming planes.

1. Create or import a thin-walled part like the one in the following image.
   Note: The open face is tangent continuous.
   
2. Define two work planes and two work points (see the red circles) along the path.
   
3. On the ribbon, click 3D Model tab Plastic Part panel Lip .
4. Select the two paths (shown in blue and red in the picture).
   Note: Do not select the chamfer edges; leave the path open.
5. Select the Z axis as the Pull direction.
   
6. Use the manipulators on the preview to adjust the Lip cross section and the clearance volume. You can drag the cross section to a more convenient location along the path.
   
7. Expand the Path Extents selector, and select the two planes and the two points. At first, the Lip algorithm makes a tentative choice of sectors. Use the green and yellow dots to choose which sections to keep or remove.
   
8. Click the green or yellow dots until the configuration is like the one in the picture.
   
9. Click OK.