This model has a clip on clip off magnet system. 

Assembly

The assembly is the same as the first one but just with magnets.

For those who need a refresher

First print out the two halves and the propeller. Next get a 9V battery, a 9V battery adapter, wires, a toggle switch and a DC motor. Put the peices in the places shown in the picture and connect the wires together. Finally switch the toggle switch.

Buy 8 1cm by 1cm magnets and make sure that one side is the north and the other is south.

CHANGES

We have improved the system to have magnets for a faster pullout and less wear and tear between parts. We also Have improved the propeller to have more blades for more powerfull air flow.