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RickRap
Just saw this.
I have 3 BLTouch in use. Very happy with their performance. I'm using MKS 1.5 running marling 1.1.x RC8. Took me FOREVER to get this configured correctly.
I'm assuming you have endstops for x/y axes as well, correct? Z homing won't happen without those.
I will share my Marlin settings. The only issue I have right now is that during bed leveling probe, Z does not go up as high as I'd like for the second touch.
I have the X/Y end stops (Min only) and they work fine. It's just the Z and BLTouch that doesn't trigger.
I'm starting to believe that the board configuration might be at fault. There are multiple versions of the MKS board and I haven't found an authorative source showing the pins on the board. Marlin gives a pinm number, but where on earth is that pin on the board???