Talon: A Self Retracting Utility Knife

In 2.009 - Product Engineering Processes, MIT's Meche senior capstone class, I worked in a team of twenty over the course of four months to go from an initial concept to a final working model.
 I worked to create the housing for Talon, a utility knife that retracts upon contact with skin. Talon is unique because it allows the user to replace the blade and uses a capacitive sensing circuit to retract the blade back into the housing. I worked creating a product that was comfortable to hold and had internal fixtures for the various mechanical and electronic components.
The final result is a working model with a retraction time of 24 milliseconds that was presented to 1300 practicing product designers, entrepreneurs, academics, classmates, and a  webcast audience.