About this 3D model

A twin rotor animated helicopter pull, push, downhill toy. The front and rear rotors spin as this toy is pushed, pulled or sent down a hill, in front/rear true counter rotating fashion (I have an aviation background, sigh...). Video of prototype is here: https://youtu.be/erEuyxCtarI. Designed using Sketchup Make 2015, and printed in PLA on a Makerbot Replicator 2 using Makerware 2.3.3.42 "Standard" Settings (.2mm layer height, 2 shells, 10% infill).