Z Level Completion is used when you wish the tool path to move up to the clearance plane between each pass. Effectively completing one pass in Z, then retracting, moving to the start of the next pass, plunging and then finishing that Z level cut and retracting to the safety plane, and repeating the process.
The Prompt will appear on the screen when using the NURBS_CCW_XY horizontal slicing cycle.
YES is used when a Cavity or Core contains multiple hills and valleys. YES will cause the toolpath calculator to complete all toolpath(s) required at each Z level, retract, and then go down to the next Z level.
NO continues to cut downward until complete.
Yes produces a tool path similar to this:
Where the tool is retracting between each slice it takes in XY at the current Z plane.
No produces a tool path similar to this:
Once the tool completes a slice in the XY at the current Z plane, it simply moves down to the next Z plane and starts another slice in XY.