Gravitrax Archimedes Screw

Laying out a continuous run of more than a dozen or so marbles requires they be continuously lifted to a high starting position. One option is to construct a an Archimedes screw. (Another option, shown on a another page, is a Gravitrax Ferris Wheel.)

I found this 3D model a few years ago on Thingiverse, but its no longer there. I do know it was provided by Franck, username ffleurey, with some details at https://www.myminifactory.com/users/ffleurey. I converted it to be driven by a Lego Mindstorms motor.

Franck's Archimedes screw

Lego Mindstorms motor driving the screw