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Here, not mine but I expect to achieve as good as these results.

"In my case GCode M48 ;” Z-Probe Repeatability Test” returns the following:
Mean: 0.002250 Min: 0.000 Max: 0.008 Range: 0.008
Standard Deviation: 0.002359"
From https://www.thingiverse.com/thing:2841443

That are good enough for something I did with parts I can found forgotten at the bottom of a large plastic box.

DIY Probe, OptiServo Z-Probe Sensor - 18mm mounting
by robscar