I designed this small device to be able to alert me in the unfortunate event the nozzle clogs. It does so by monitoring the flow of the filament during the print and emitting an acoustic signal if it stops during 7 minutes or more. Attention: A new version of this clog detector using a PCB instead of wires will be released very soon. Stay tuned to my YouTube channel! https://youtu.be/fHWlwqQw9eQ