Better Mount  Ender 3 Filament Runout Sensor for Z limit switch
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Better Mount - Ender 3 Filament Runout Sensor for Z limit switch

I really liked Xquas Ender3 Filament Runout Sensor using z limit switch design but found it annoying to have to models ...

similar models —

Better Mount - Ender 3 Filament Runout Sensor for Z limit switch alternatives