The downloadable fan is made of three sliding leaves assembled with a string. You can download the stl files on this page and have them printed by a local specialist in additive manufacturing. I uploaded them to sculpteo.com, and tried them in the techniques selective laser sintering and multi jet fusion and in the materials polyamide and polypropylene, which worked very well. Once you have the pieces in your hands you just slide the knobs into the slits and secure the construction with the help of a string(2-3mm wide). In the great artistic tradition of fan making you could paint and decorate the leaves or find a string that reflects your taste.