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[Marlin] G029 - Bed Leveling Manual
📅Update: 2020/10/13
Mesh Bed Leveling (MBL) allows interactively measuring a Z height mesh without a bed probe. The only tool required is a piece of paper or a feeler gauge. MBL uses the mesh to compensate for variations in height across the bed.
- 1.Use
G29 S0to get the current status and mesh. If there’s an existing mesh, you can send M420 S1 to use it. - 2.Use
G29 S1to move to the first point for Z adjustment. - 3.Adjust Z so a piece of paper can just pass under the nozzle.
- 4.Use
G29 S2to save the Z value and move to the next point. - 5.Repeat steps 3-4 until completed.
- 6.
G29 [I<index>] [J<index>] S<0|1|2|3|4|5> [X<count>] [Y<count>] [Z<linear>][I<index>]With S3, the (0…n-1) X index of the mesh value to modify.[J<index>]With S3, the (0…n-1) Y index of the mesh value to modify.[S<0|1|2|3|4|5>]- S0: Produce a mesh report (see examples below).
- S1: Start probing mesh points.
- S2: Probe the next mesh point.
- S3: Manually modify a single point with X Y Z parameters. (See also M421.)
- S4: Set a global Z offset. Positive values are away from the bed; negative values are closer.
- S5: Reset and disable mesh.
S0 mesh report:
> G29 S0
Num X,Y: 3,3
Z offset: 0
Measured points:
0 1 2
0 +0.011 -0.020 -0.026
1 +0.017 +0.002 -0.019
2 +0.022 -0.030 -0.013
Modify some mesh points and view the new mesh:
> G29 S3 I2 J2 Z0.042
> G29 S3 I1 J1 Z-0.666
> G29 S0
3x3 mesh. Z offset: 0
Measured points:
0 1 2
0 +0.011 -0.020 -0.026
1 +0.017 -0.666 -0.019
2 +0.022 -0.030 +0.042
Last modified 3yr ago