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For stand-alone, single filament use, armature with bearing detects filament ABOVE Bondtech drive gears.

For MMU2S, internal lever senses filament separating Bondtech gears. MMU2S uses this to know when filament has reached drive gears.

You can swap filament sensing system WITHOUT a full extruder tear down. Simply remove motor plate and IR sensor board. Then, swap armature and internal sensing lever and move magnet. For now, build the option that matches your needs.

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