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My Filament Ran Out During a Print

When your MakerBot Replicator Z18 senses that the Smart Extruder+/Smart Extruder has reached the end of a piece of filament, it will automatically run the Unload Filament script. When the extruder has finished unloading, wait for it to cool to at least 50°C. Then remove the last piece of filament from the extruder and select Load Filament. When you have finished the load sequence, go to Back to Menu > Resume.  

My printer didn't automatically unload filament

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