I make comes from two ideas: http://www.thingiverse.com/thing:278078 and http://www.thingiverse.com/thing:52810. Make a propeller to fly is not an easy task as well with a propeller that has been proven to fly and have a fairly light weight and combine everything. So I thank them, nglasson and Landru.
To get the fly fairly straight up takes a few time the exercise before finally created the video, I do not know how the altitude may be more than 3 meters (https://www.youtube.com/watch?v=rzncnjJ12FM).
Usage advice, hold the holder of approximately 2/3 of the bottom using the thumb and forefinger of your left hand, upper air flow is down and the propeller rotated clockwise. Rotate several times using the right hand index finger clockwise to a position slightly to the middle of the propeller. It should play in the wider space, not in the room for very thin blades would break if hit a wall or something.
I print them using PLA, with the layer height 0,2mm, also with a brim 2 mm, support is not needed. If the holes are still covered, use a drill for drilling holes 0.8 mm in diameter.
Remove brim using scissors, then sandpaper brim remaining (size: 80 and 320). Sandpaper (size: 80, 320 and 1000) all surfaces in contact, ie at the propeller with the holder, the holder with a paper clip hook. I attach sandpaper to ice cream stick with using double-sided tape, such as the photo attachment.
To balance the blades, insert the needle into the hole in the propeller, then turn let it stop and do this a couple of times, marked with a permanent marker lightest part is the tip of the blades that are the top than the other end. Then sandpaper parts that are not marked, remove dust, play a few times, then check if it is balanced, if not, do it again this process until you get a balanced propeller.
Cut the paper clip along the 30mm and straighten using pliers, bend the letters u 5 mm formed at one end with a width of approximately 1.5 mm, insert it into the hole propeller. Then create a hook with the help of screws size 4 mm. Do the same thing on the other propeller.
Attach 2 pieces of rubber bands corresponding to the width of the hook, not too tight or too loose, diameter approximately 45 mm.