About this 3D model

How better to "wind up" the helicopter series than with a Windup Helicopter! All components, including the spring, are printed in PLA. Video of prototype is here: https://youtu.be/fXo1cwoLAJE. 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).