Small Whirly copter with a spiral spinner stick

The STL's are scaled to a height of 150mm as that is the max for our printer. The copter is ~80mm diameter. It's small but we were making small toys to give away at a fund raiser carnival. Two sets with supports under the blades requires ~7m of 1.75mm filament.

Also attached is OpenScad file adapted from seedwire's 'The Whirly One' http://www.thingiverse.com/thing:36217. It should be possible to change the turns per cm of the spin stick and the blade pitch/thickness/width. You can genera