The Ball Fan is an easy to assemble desk fan. A simple 4.5V motor, 24mm in diameter, will fit snugly into the back cage, and can be bought from any electronics store.
If you wish to create a custom base, the entire cage is 92mm in diameter.
The design itself is Inspired by U-LIKE’s ‘USB Desktop Fan’, and 11+’s USB-powered ‘O-fan’.
http://www.infmetry.com/products/u-like-usb-desktop-fan
http://elevenpl.us/product/o-fan/
Honors student at the University of Canberra, currently using these designs as part of a study into 3D printing websites. Please download and like my designs, and post pictures when you make them.