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---
tag: m0420
title: Bed Leveling State
brief: Get and/or set bed leveling state and parameters
author: thinkyhead
contrib: sustmi, shitcreek
requires: AUTO_BED_LEVELING_(3POINT|LINEAR|BILINEAR|UBL)|MESH_BED_LEVELING
group: motion
related: [ G29, M421 ]
codes: [ M420 ]
notes: |
- [`G28`](/docs/gcode/G028.html) disables bed leveling. Follow with `M420 S` to turn leveling on, or use `RESTORE_LEVELING_AFTER_G28` to automatically keep leveling on after [`G28`](/docs/gcode/G028.html).
- The "current position" may change in response to `M420 Sn`.
parameters:
-
tag: L
optional: true
description: Load mesh from EEPROM index (Requires `AUTO_BED_LEVELING_UBL` and `EEPROM_SETTINGS`)
values:
-
type: int
-
tag: S
optional: true
description: Set enabled or disabled. A valid mesh is required to enable bed leveling. If the mesh is invalid / incomplete leveling will not be enabled.
values:
-
type: bool
-
tag: V
optional: true
description: 'Verbose: Print the stored mesh / matrix data'
values:
-
type: bool
-
tag: T
optional: true
description: Format to print the mesh data
values:
-
tag: 0
description: Human readable
-
tag: 1
description: CSV
-
tag: 4
description: Compact
-
tag: Z
optional: true
description: |
Set Z fade height (Requires `ENABLE_LEVELING_FADE_HEIGHT`)
- With Fade enabled, bed leveling correction is gradually reduced as the nozzle gets closer to the Fade height. Above the Fade height no bed leveling compensation is applied at all, so movement is machine true.
- Set to 0 to disable fade, and leveling compensation will be fully applied to all layers of the print.
values:
-
type: float
tag: linear
-
tag: C
optional: true
description: Center the mesh on the mean of the lowest and highest points
values:
-
type: bool
examples:
---
Get and/or set bed leveling state. For mesh-based leveling systems use `Z` parameter to set the Z Fade Height.
With `AUTO_BED_LEVELING_UBL` you can use `L` to load a mesh from EEPROM.
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