I’m using a standard TAZ5 build plate, no mods. I installed a capacative auto-leveling system recently and it’s been working great.
I went to do some tweaks to it, which resulted in the locations measured to be different than they had been, and on 2 spots on the bed (from a 3x3 grid of leveling) the sensor didn’t activate at all, even after the safety physical limit switch had been triggered. I just spent forever trying to figure out the problem, cleaned the bed, remounted and recalibrated the sensor, everything. It worked fine on all the tests I did - until the auto-level ran again.
It was then than I realized the auto-level keeps running the tests in the same spots. So I made sure the sensor was calibrated, then moved it to the same X/Y position, and did a manual Z level. Like the G29 auto level, it overshot and hit the bed.
I then played with position, and found out if I moved the bed back just 5mm, it leveled fine. If I brought it forward 4mm, the sensor didn’t activate. If I sent it forward another 20mm, the sensor worked.
I always autolevel with the heat on, to take into account expansion. I’m wondering if it’s a cold spot on the bed? Or maybe the sensor is picking up the wiring from the heater and thats a dead space? Is there a diagram of the wiring layout anywhere I can reference?
Anyone experienced this themselves?