...
Proto G published his detailed guide on how to build a 3d printed stepper motor. It is probably not as good as standard ones but it looks very usable for simpler projects.You will need an Arduino, copper wire, magnets and other non-printable parts but you probably guessed that part.
Here is a video introduction:
Detailed build guide and all the files needed:
http://www.instructables.com/id/3D-Printed-Stepper-Motor/
Great work Proto G!
...
