Drive a stick? How about a little haptic and visual feedback to help you shift gears? The Haptic Feedback Shift Knob works in conjunction with an Android app that monitors a vehicle's RPM, speed and accelerator pedal position. The app vibrates the shift knob when it's time for the driver to change gears. The knob was originally designed by Ford engineer Zachary Nelson, who explains in this video how he uses an inexpensive (sub-$1,000) MakerBot 3-D printer with open source software to design and build the part. The shift knob also has embedded electronics for driver feedback, push buttons to activate voice controls, and other features.