Summary

Building a homemade alternator that produces 10 volts 150 mA is a satisfaction. http://www.youtube.com/watch?v=GNR8xGPmUM0
For this print I used other my jobs like winder and coil customized
http://www.thingiverse.com/thing:100648
http://www.thingiverse.com/thing:73915

materials:

• Wire copper coil 0.018
• 2 bearings 4.5/13mm
• Central magnet 30/10
• 4 magnets 25/3
• 2 smaller magnets as terminals