Due to a lack of modeling files provided with the original propeller, I modeled a version of my own that is more robust. SolidWorks ( .sldprt ) file included as well as .step, and .stl if you wish to remix. Flies just as high from what I can tell. The children didn't break this version. 

I printed them in PLA with .2mm layer height ( .6mm nozzle) and no supports. 

For use with agepbiz's Pocket Copter [https://www.printables.com/model/421807-pocket-copter](https://www.printables.com/model/421807-pocket-copter) .