1. Turn on the 3D printer
2. Use the filament removal assistant by choosing from menu:
OK -> Prepare -> Unload filament
Then follow the instructions displayed on the screen
WARNING! You can not remove the filament without unlocking the extruder’s lever and warming up the hotend. It may lead to the hotend’s damage. Do not leave warmed up hotend, not matter if it is filled with the filament. The nozzle may be left warmed up for a long time only during the printout.