I am a little bit skeptical that a Proximity Probe is going to be more accurate than a micro-switch on a servo driven probe leg. It might be. But I would want to see one in action and take some measurements before I convert my printers over to it.

I am confused about what this Proximity Probe puts out. It appears it does a Normally-Closed when nothing is close. And it says NPN when it is close. NPN? Is the output driven by a NPN transistor? It would be helpful to see a sample circuit diagram with this part in it.

And lastly... It says it has 100 hz output response. I'm guessing that is as fast as it can switch and not really the output signal. Because if it puts out a frequency as the response, it is going to take firmware changes to recognize it is close to something.