There isn't anything that runes more in this warm summer than a hand-held fan!
This things were used a long time ago, in ancient Greece and now we can continue using them... but 3D printed!
You can take it to the beach or to the swimmingpool and cause envy. Feel free to combine colors as you like; different printing colors, different papers, fabric...
You can also print it bigger and pay someone to fan you!
*Edit: I also created a fan holder because after some use the fan kind of spreads.

Follow the instructions for better results:

1. Print Fan cover x2, fan sheets x14.
2. Introduce a 1.75 mm PLA filament or other filament type trough all the pieces' holes.
3. Cut each side of the filament leaving 2mm each side then heat both ends. Just before it starts to melt push it with a flat surface. That will turn the filament thicker and will prevent the pieces from scaping.
4. From here, grab a DIN A3 paper sheet and follow the pictures. Be patient and enjoy the results!

You can just glue the pices on a paper, make it foldable, use fabric... Feel free to invent!