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A genuine Makerbot extruder stepper motor, genuine Makerbot pinch gears, and a machined, aluminum filament feeder from the eBay seller cre8it. As of this writing, 6 July 2014, Makerbot is still selling these motors and pinch gears. They do charge a premium for the motors -- $30 USD -- but if you want a small motor, this is the ticket. You may be able to find a comparable motor elsewhere for less.
These aluminum filament feeders from cre8it are largely based upon Wingcommander's design,
Makerbot Mechanical Endstop v1.2 with the switch removed and replaced with a two position screw down terminal post occupying the Common and Normally Open (NO) pads.
3d-printable computer fan model for testing #3dprinter overhang structures. thingiverse.com/thing:971944