Dealing with Slider Extension Failure
When you select the black volumes to be included in the slider geometry and specify the projection plane, the system tries to extend the selected black volumes up to the plane, in the direction normal to it. Depending on the black volume geometry, and on the location of the projection plane, sometimes the system is unable to generate the extension. In this case, the system issues an error message that the boundaries could not be extended, and gives you an option to create a slider volume based on the undercut geometry without the extension.
To create a slider if the boundary extension fails:
1. Create the slider as a Mold Volume.
2. When the boundary extension fails, click 
under Projection Plane to deselect the projection plane.
under Projection Plane to deselect the projection plane.3. Click 
to create the slider volume based on the undercut geometry.
to create the slider volume based on the undercut geometry.4. Use the standard Mold Volume operations, such as Sketch or Trim To Geometry, to extend the slider volume as needed.
5. Extract the final volume to create a slider component.