I am currently working on a replica of the Minivac 601, an electro-mechanical computer from 1961 (see the Wikipedia entry for details). For this project I require a rotary switch with the following characteristics:

• 1P16T
• Continuous Rotation
• Non-Shorting
• Panel Mount
• Motorized

This last requirement is the kicker. Without having to drive the switch via a motor, a fair number of parts meet the remaining criteria. However I was unable to see how any of them could be easily motorized. Some are physically too small, and most require a fair amount of torque to switch between positions.

So I came up with the following 3D printable design that uses reed switches and magnets.