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Here is my Gravitrax compatible motorized 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.
Link to the motor:
* www.banggood.c...
Link to the 3D model:
* www.myminifact...
* www.thingivers...