I loved the idea the dremel devil http://www.thingiverse.com/thing:266035
I wanted a more efficient model in flight and a more effective system of launch.
The propeller mounts easily to 30m , no need to put any puissace on the dremel .
To fly the propeller, just turn on the drill. When you're ready for take off , simply turn off the dremel to free the propeller.
I printed my prop with pla 100% infill without support. ABS shoud be good too.