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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
This is my first test of my Pinhead 4X5 pinhole camera, a design for 3D printers. (Yes, I printed this myself, at home. The design is available on Thingiverse at: www.thingiverse.com/thing:143882 )
I had a film holder loaded with Ilford Multigrade paper already, so I used that for this test. I put very little effort into framing the shot because I knew it was going to take 15 minutes or more and the sun was setting! So, this is a hastily composed photo, just for the sake of evaluating the "lens" and the camera itself. (Yes, I made the brass shim pinhole myself: approximately f235)
Post-processing was done with Lightroom and the Silver Efex Pro2 plugin.