Want to save $200-$300? Here's how! This fully 3D printed sequential shifter doesn't require any hardware. The only thing it needs is filament, 2 keyboard switches, and an Arduino Nano. It offers resistance when you pull it and then gives to press either keyboard switch. 

To assemble, put the spring into the lever, then the nub, and then insert the nub pin. Then put the lever through the hole in the top of the housing and put a pin in. Put a keyboard switch in each of the square holes in the bottom housing, wires go out of the small holes in the side of the top housing. Pin the top to the bottom. Wire the switches so that one contact of each switch goes to ground and the other goes to D3 and D4 on the Arduino Nano. 

For best function, lube the lever pin, the contact areas where the lever pivots, the detent on the bottom, and the nub. If the shifter sticks one way or the other, then you probably need to lube it. I used Superlube synthetic grease. 

There are hooks for adding rubber bands if you need them, or to make it feel more like an e-brake. 

Program to use it can be found here: [https://github.com/qblackfoxp/sequentialshifter](https://github.com/qblackfoxp/sequentialshifter)

I designed this in a day and so far, for me it works perfectly. If you have any suggestions, let me know. I am not an engineer, so it may not be perfect.

Enjoy!