Guide: https://learn.adafruit.com/iot-filament-sensor
You can build an IoT sensor for your 3D printer so you can be alerted if you’re out of filament. We think this is a great proof-of-concept that can help prevent failed prints.
This project uses an IR Optical Sensor that can detect whenever an object passes by the sensor. The breakout is mounted to a 3D printed bracket right above the 3D printer!
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