Paperclip Motor

This is a simple electric motor powered by a single AA battery. It can be used in science, physics, or technology classes to help convey some basic principles of electromagnetism or with your own kids on the weekend for a bit of science fun.

The motor does not utilize commutation. Rather, it uses inertia and magnetic attractive and repulsive forces to maintain rotational motion. In the electromagnetic coil, magnetic flux F = N * I where N = number of turns of wire around the bobbin and I = the current flowing through the wire. Increasing the number of turns or increasing the current increases the magnetic field generated. Increasing the number of turns requires more wire, which increases the resistance of the circuit resulting in a decrease in current. Can you find the optimum balance of turns/current to maximize the magnetic flux :-)?

The motor consists of the following 3D printed parts:
(1) Simple Bobbin (you wrap the copper wire around this part)
(1) Fan (optional; for