Doesnt work, won't trigger reliably and the sensor isn't sensitive at all.
The description says MK8 (8mm nozzles) but the supplied foam is for the 6mm nozzles so getting it to stay on an MK8 is difficult. The supplied Dupont wiring cable is wrong for the comparator PCB and doesn't work. If you use the single Dupont ends you can at least connect the correct pins, but the Dupont 3 connector doesn't fit any RAMPs board either. So...plan on doing some re-wiring. There are no supplied wiring schematic, instructions, usage or anything else. Google is your friend here. There's an adjustable potentiometer on the PCB, but no instructions on what it does or how to adjust it for the best performance. The sensor reacts best to pressure as opposed to a quick tap with the nozzle. At any rate, I got it working and it preforms nicely once you get it all figured out. But to get to that point isn't easy. Be aware.