How to make a gearbox two speeds forward and one reverse?

Sorry, someone who can help me with the design of a gearbox with two forward speeds and one reverse if I can help with that would appreciate you very much. By any measure this well need to print.

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Take a look here: 5 Speed and Reverse Manual Transmission. This one has 5 forward and 1 reverse, you just have to eliminate some gears.

 
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