The file 'Printable Alternator 3D Printer Model' is (stl) file type, size is 43.6KB.
Check out this printable 3 phase alternator I designed a while back, I don't have a reprap so it hasn't been tested yet. It is fairly crude, but it should be able to generate electricity.
More info here:
http://dev.forums.reprap.org/read.php?1,11789,page=1
alternator_magnet2.stl | 398.1KB | |
alternator_stator3.stl | 285.1KB | |
coil_winder_for_alternator.stl | 97.3KB |