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Weird G29 behavior
When performing the procedure my arm drops, then the Z descends and then moves back up before moving down again to probe the bed. The weird part is that I thought that is was supposed to move down and when the probe touches go back up and then descent again at a lower rate for accuracy. On my printer the probe never touches the bed before it moves back up. The slower decent does probe the bed.
Is this normal?
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What happens if you manually trigger the switch before it moves very far? Does it recognize the switch got pressed?
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I had a similar issue, it ended up being the wiring to the switch was getting pulled while extending the arm. Marlin thought it was triggered so it never touched the glass.