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extruding at the very beginning of the print, please see the Not Extruding at Start
of Print section.
12.1 Out of filament
This one is pretty obvious, but before checking the other issues, first verify
that you still have filament leading into the nozzle. If the spool has run out, you
will need to load a new spool before continuing the print.
12.2 The filament has stripped against the drive gear
During a print, the extruder motor is constantly spinning trying to push the
filament into the nozzle so that your printer can keep extruding plastic. If you try
to print too quickly or you try to extrude too much plastic, this motor may end up
grinding away the filament until there is nothing left for the drive gear to grab onto.
If your extruder motor is spinning, but the filament is not moving, then this is likely
the cause. Please see the Grinding Filament section for more details on how to
resolve the issue.
12.3 The extruder is clogged
If none of the above causes apply to you, then it is very likely that the extruder
is clogged. If this happens in the middle of the print, you may want to check and
make sure that the filament is clean and that there is no dust on the spool. If