It becomes harder and harder to blow my birthday candles, here comes the hand cranked blower ! If you want to see me in training : http://vimeo.com/73108405 4 shapes for the blades: straight, involute, forward and backward. 1 crank turn gives a bit more than 36 fan turns with default settings.   September, 8 2013 http://vimeo.com/74023928Joined .stl are for M8 nuts, "Open in Customizer" for other sizes.   Inspired by Vik Olliver's Forge Blower but not derived from it.