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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,
New 400mm rods, but the stock Z-axis threaded rod is long enough. Custom Replicator case increases build height by 100mm.
Assembled extruder with heatsink and 24 VDC fan, top view.
Be sure to use a 40 x 40mm 24 VDC fan. MBI uses approximately a 5 CFM fan, but you can get much better, quieter fans which move more air (higher CFM). The fan shown is approximately 7 CFM. Note arrows molded into the side of the fan and orient the fan such that it blows towards the heatsink.
The M3 bolts with which the fan and heatsink are affixed are 45mm long.