I have a Mark II which I got when it released. It has the stock sensor with a blue cap at the bottom and a red LED at the top. It has no manual z-stop switch.
I have upgraded it from stock to run 4.0.3, and other than that, it has no mods or other adjustments. I have double checked I am running the correct mainboard/LCD firmware.
I can’t for the life off me figure out how to configure the z-height. No matter what I do, the extruder just hits the build plate and keeps pressing down until I turn the printer off.
I have gone into Settings > Sensor > and set the Z-height to 3mm, which is about how far the sensor is above the extruder.
Do I have the wrong kind of sensor? The one that shipped with my printer doesn’t have a needle to stow/deploy.
Any help is greatly appreciated!