Z-offsets:
There’s so many different ones it get confusing.
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Auto level Z-offset, at the very last point when running Auto Level it moves just a little from that end point and that’s where you set the Z-offset for Auto leveling. All of the grid points in the leveling process are adjusted according to that particular Z-offset. The system doesn’t know the exact distance z wise between the leveling sensor and the print nozzle. This is how it adjusts for that.
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Running Z-offset is one set on the Touch Pad while a print job is running and is used to effectively move the Z origin up or down by that offset amount. That value is remembered from job to job (It wasn’t in Firmware versions earlier than 1.9 I believe). I believe it also remembered after powering down.
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Grid Z-offset, is the value saved in each grid point. The values in the leveling grid are the different Z-offsets unique for each grid point. That’s how the leveling software works. The Grid is also referred to as the “matrix”.
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Z probe Offset. This one saved in the settings inside the controller. It’s set with M851. The documentation says: “Set the vertical distance from the nozzle to the Z probe trigger-point.” This is probably only used when doing the Auto Leveling process.
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Active Z Offset. This is what is calculated by the controller depending on what the location in the X & Y directions currently is. I believe this is calculated by the nearest grid point values.
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The Misnomer Z Offset. The label in the jog screen describing the movement in the Z direction. (As mentioned by @MooseJuice in the next post!)