I made it in about 2 minuts.
But there is not enough power from the USB port so the fan spins fast but not fast enough.
sorry about that but it produces enough thrust to move a piece of 4mmX4mm paper.
I used some images from the web because i couldn't take the right photos.
Step 1: Get the parts and tools
1 brushless fan
1 USB cord
2 paper clips
Step 2: Putting it together
1-connect the wires from the fan to the USB cord.solder or twist
2-wrap the tape around the connections to stop short circuts.
3-bend the paper clips to form legs and screw them in place.
Step 3: Testing
just joking :-)