Tried printing having set up the CuraEngine slicer as seemed right, saved the gcode file, transferred it to the main computer and uploaded it to the Duet. All the usual pre-printing actions happened. Hotend and bed started heating up, all axes homed and it performed bed level calibration. When hot it ran the extruder at an enormous speed and stripped the filament. Not seeing a Stop Print I used Pause. Then I searched in vain for a Stop Print control but no joy. There only the Emergency Stop which turns everything off leaving filament in the hot hotend with no cooling fan running BAD. Guess the work-around is to turn the heaters off and let the hotend cool before turning the main power off.