# SM2 Bed Leveling 101

**URL:** <https://forum.snapmaker.com/t/sm2-bed-leveling-101/6146>\
**Category:** Snapmaker 2.0 (3-in-1)\
**Created:** [April 19, 2020, 4:54pm UTC](https://forum.snapmaker.com/t/sm2-bed-leveling-101/6146 "2020-04-19T16:54:50Z")\
**Posts on this page:** 1\
**Showing post:** 48

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**Author:** ![Tone](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/tone/32/1278_2.png) [@Tone](https://forum.snapmaker.com/u/Tone)\
**Post date:** [January 4, 2021, 11:55pm UTC](https://forum.snapmaker.com/t/sm2-bed-leveling-101/6146/48 "2021-01-04T23:55:25Z")

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Z-offsets:

There’s so many different ones it get confusing.

1. **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.

2. **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.

3. **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”.

4. **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.

5. **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.

6. **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!)

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