If for example you use the fan header on the printer. Wind a couple of electromagnets small enough or take apart a small solenoid and use those parts you could have a very low friction high precision positioning that is activated by the fan header on any ramps board, or even an auxilary output with a relay to 12v. The electromagnets will be in order of magnitude stronger than rare earth magnets and very controllable. Power= stuck /no power = its loose.
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