A cylinder for a replica Soviet Nuclear Launch Key.
This is meant to be paired with two micro SPDT switches:
Sparkfun.
The key can also be purchased on Shapeways:
Shapeways Product Link.
The key is meant to be inserted into the cylinder, rotated 180°, and trigger both switches. This is not meant for anything security-related and is meant for hobby projects.
PLEASE NOTE: this has not been printed and tested yet. Once tested I will update this description with actual information about any adjustments needed, pictures, and maybe even a video.