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.
This is great work. Would you describe this as a "photoelectric filament sensor"? Looks very similar to what they implemented on the CR-6 SE (about halfway down the page):
I love this design! So simple and clean, and you've got lots of great build details in there. I really like the use of the balloon piece for friction on the encoder wheel. Great job!
I was thinking of designing a clogged sensor just like this... well done!