This would be under the proximity sensors, but the Hall-o effect sensor z-probe (others would be optical sensor z-probe) is one that I implemented on my printer when I first got it up and running. The downside is that it has to be manually deployed. I will say that I no longer use it because I prefer to manually calibrate, but I do recommend using this design because it is a good design and it was a really cool way of sensing when the probe hit the bed.
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