Failed 3D Print was Saved

failed 3dp saved gcode edit3D prints fail for many different reasons.  Here it looks like the printer ran out of filament while printing.  This was a very long print and lots of time would have been wasted if he/she needed to start over.  So, the print was paused, a new spool of filament was loaded, then the gcode was edited to account for the missing layers.  More info here.