Printrbot Simple Metal Feedwheel

I loved Spiernik's original design (found here: http://www.thingiverse.com/thing:652031) so much because of the way it brings out the movement from the extruder stepper motor, that I had to remix it and add some flourishes. I made it more prominent and changed the spoke design to something a little more decorative and less organic. Finally, I increased the length of the shaft to allow more clearance for the locking extruder handle I use (found here: http://www.thingiverse.com/thing:651391)

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