The extruder usually mounted accepts 3 mm filament, and can print either ABS or PLA. There is an alternate extruder for use with Ninjaflex.
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The extruders available accept 3 mm filament, and can print either ABS or PLA. There is an alternate extruder for use with Ninjaflex, called 'Flexistruder' but the Flexistruder is not supported with the current firmware installation.