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ATTENTION: There is an EMI issue between the filament sensor and the Extruder motor. I'm going to try and fix it this coming weekend, but when the extruder is running it floods the sensor with noise (thousands of false alerts).

UPDATE 5/24/19: EMI issue has been resolved by changing the routing of the sensor cable (direct vice through the body) and adding a 13mm diameter ferrite core to the sensor cable. Note: the cable needs to be wrapped at least twice around the core before clamping it together.