Just an idea that has been rolling around in my head at this point... basically the idea is to use a Wade's Extruder-like mechanism and attach it to the base of a Filament Spindle that I'm building to turn it into a printable turntable for 3D Scanning using SplineScan. The stepper would use the gears from a Wade extruder to do very slow turns. Would be connected and controlled from RepRap firmware as if it were another extruder. Possibly use a MAX endstop port for calibrating position. Half of a Filament Spindle would make a perfect base and provide a vertical pole to mount laser line and webcam.
Hmm, a rotating Filament Spindle might also be handy for wrapping filament...