This is a model of a dual clutch and it's gearbox. This model is extremely simplified. It does however show the schematics of a dual clutch and how the gears are arranged. This model also features a cutaway of the most important essential part of this invention: the hollow shaft. You can see the inner shaft, which is not cut.
Since actual gears have a case they are in an "hold onto", whereas here you can only see gears, this model does not feature any moving parts, sorry. I could make the shift collars be able to slide back and forth, but that seems useless and to detailed for printing.
Weather you would value such a model as keychain is your choice but I needed to make this already :)