Fan box
thingiverse
Take a switch, an led, a motor with a 2 mm-diameter axis, a 9 volt battery with its adapter and assemble these parts, set an helix on the motor axis and you got a portable fan ! Look at the picture of my wooden prototype :) The motor I use come from a ps2 controller vibrator
Download Model from thingiverse
With this file you will be able to print Fan box with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Fan box.