Gravitrax Motorized Marble Lift

This is my Gravitrax compatible marble lift. I have designed it around a small 5V geared motor. It is designed to be easy to print and easy to build. Several variants can be printed to lift marbles to different height. The lift has 3 inputs and outputs. EDIT 29/02: Added spirals in one piece with various sizes as well as counter-clockwise versions of the spirals. You can pick the right spiral depending on the direction of your motor. If you have the wrong direction you can reverse the polarity