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---
tag: m0421
title: Set Mesh Value
brief: Set a single mesh Z height
author: thinkyhead
requires: AUTO_BED_LEVELING_(BILINEAR|UBL)|MESH_BED_LEVELING
group: motion
related: [ G29, M420 ]
codes: [ M421 ]
notes:
parameters:
-
tag: I
optional: true
description: X index into the mesh array
values:
-
type: int
-
tag: J
optional: true
description: Y index into the mesh array
values:
-
type: int
-
tag: X
optional: true
description: X position (which should be very close to a grid line) (`MESH_BED_LEVELING` only)
values:
-
tag: linear
type: float
-
tag: Y
optional: true
description: Y position (which should be very close to a grid line) (`MESH_BED_LEVELING` only)
values:
-
tag: linear
type: float
-
tag: Z
optional: true
description: The new Z value to set
values:
-
tag: linear
type: float
-
tag: Q
optional: true
description: A value to add to the existing Z value
values:
-
tag: linear
type: float
-
tag: C
optional: true
description: Set the mesh point closest to the current nozzle position (`AUTO_BED_LEVELING_UBL` only)
values:
-
type: bool
-
tag: N
optional: true
description: Set the mesh point to undefined (`AUTO_BED_LEVELING_UBL` only)
values:
-
type: bool
examples:
-
pre: Set the Z height in the middle of a 5x5 grid
code: M421 I2 J2 Z-0.05
-
pre: Set the same Z height using XY
code: M421 X100 Y100 Z-0.05
-
pre: Adjust the mesh point by -0.01
code: M421 I2 J2 Q-0.01
---
This command is used to set a single Z value for a mesh point in the stored bed leveling data.
Allowed forms are `M421 In Jn Zn`, `M421 Xn Yn Zn` (`MESH_BED_LEVELING` only) or `M421 C Zn` (`AUTO_BED_LEVELING_UBL` only).
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