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I need a mechanism so that if a (NXT) motor rotates forward, it moves one gear, but the other stays still, but if it rotates backward, the first gear does not move, but the second one does.

I found an example for half here (I would need 2), but that seems like it would take part of a rotation to pick up, and I need mine to be really precise.

I am building this for the Z-Axis/Extruder of the NXTStrap.

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up vote 5 down vote accepted

Would this solve your problem? Depending on the direction of the input, only one axle will turn. Depending on the direction of the input, only one axle will turn

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