This is a battery holder/base for use as a project for my 4-H electricity group.
Add a AA battery, some wire and a magnet and watch it spin.
In action: http://youtu.be/b_1SKegQsrc
Print the holder.
Make some rotor supports with 22ga copper wire. Put the rotor supports into the slots in the holder.
Glue a magnet to the top of the holder.
Make a coil with enameled magnet wire, wrapping about 3ft around a AA battery.
Wrap the ends of the wire around the center of the coil to make the rotor arms. Be sure to center the rotor arms on the coil and opposite of each other. Balance is important here!
Scrape the enamel off of one half of the circumference of the enameled wire, perpendicular to the hole in the coil.
Put a battery in and make sure electricity flows to the rotor supports.
Put the coil in the rotor holder.
Adjust the height of the rotor support so that the rotor spins very close to the permanent magnet.
Gently flick the rotor to start it going.
If the rotor doesn't spin, swap the polarity of the battery.
For detailed construction instruction, see: http://robotranch.org/blog/archives/777