About this 3D model

Here is another electric Gravitrax compatible marble lift. It is based on a small inexpensive solenoid. Here is a link to a video showing how it works and how to build it: https://youtu.be/TALEQpV4ri8 Links to the Solenoid: * https://www.adafruit.com/product/2776* https://www.kjell.com/no/produkter/elektro-og-verktoy/utviklerkit/arduino/tilbehor/mini-solenoid-p88216 Other vendors have this small solenoid. Search google for "5V mini solenoid" to find one close to you.