About this 3D model

Yes, I know, I'm just as bad as the box stores as I am already designing, printing and publishing Christmas things even before Halloween. Only four printed parts ("Track.stl", "Auger.stl", "Cap.stl" and "Star.stl") are required for a functional "A Mini Merry Marblevator Christmas Tree", additional parts will be forthcoming for "ornaments" if desired. Video of prototype is here: https://www.youtube.com/watch?v=UsCQIRXqm_c. The next video show a prototype running at various speeds from 1.5vdc through 6.0vdc: https://www.youtube.com/watch?v=99CamFug-yE. Final video speed test with Angel top:https://www.youtube.com/watch?v=Z_C7dn4Jbk0. Designed using Sketchup Make 2016, sliced with Cura, and printed on an Ultimaker 2 Extended (waiting for the Ultimaker 3!!!).