This knife earring was made for a project in my fabrication class. The design for a retractable blade that can be concealed as a fashionable accessory is based on recent national events and my continual concern of personal safety as a woman and person of color. Also there seems to be potential for functional earrings or ears as storage space for tools/devices (Earables?). Although there are some design issues that need to be resolved, the overall concept can be expressed through the 3D printed prototype (above).
I made a paper version of the casing in order to figure out the basic design and sizing. The earring hardware is from the jewelry section of an arts and crafts store and the blade is an X-acto #11 blade. This blade was chosen because of its small size and the opening hole on the base that can be used to pivot around an extruded cylinder that is sandwiched between the two casing pieces.
Above is a screenshot of the casing that was designed in 123D Design. It was my first time using this particular 3D modeling program and I think it’s okay. The interface is clear and simple although I couldn’t find some of the features I needed such as snapping to midpoint. I designed the model so that it is held together by an M3x12 bolt and nut. The model was then printed on a Folger Tech RepRap 2020 Prusa i3 which I had assembled for the class.