MMU Filament Retraction Sensor for Use with Optical Endstop | Part of my MMU Retractor Project
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MMU Filament Retraction Sensor for Use with Optical Endstop | Part of my MMU Retractor Project
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How It Works
Connect a PTFE tube to both sides of the sensor. The end with the smaller screw must face the MMU.
The PTFE tube leading to the MMU must form a curve and have enough slack to allow the sensor fork to move freely.
When the MMU unloads the filament, friction between the filament and the PTFE tube pushes the sensor fork apart, interrupting the optical endstop sensor.
This signal must activate an electric filament retractor.
As the retractor pulls back the filament, the increasing filament tension returns the sensor fork to its original position. The optical endstop sensor is then no longer triggered, and the electric retractor must stop pulling.
Important: The control system must include a timeout that automatically stops the retractor after a specified period. This prevents the retractor from running continuously if the sensor is not reset, for example, when the filament spool is almost empty.