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One motor is probably sufficient for direct drive extruder. Someone already wrote in comments under http://www.thingiverse.com/thing:200078 that he have dual motor direct drive extruder you described but I did not find the model for it yet.

With 12V version of 28BYJ-48 you will need at least 24V PSU (probably even 35V) due to resistance and inductance of the joined coils! Try to avoid 12V version at any cost.

Delta extruder with 28BYJ-48 stepper