thinkyhead

M900 - Linear Advance Factor

control Get and set Linear Advance K value LIN_ADVANCE

Description

This command sets and/or reports the Linear Advance K factors.

Setting the K factor to 0 disables Linear Advance.

With the EXTRA_LIN_ADVANCE_K option Marlin maintains two slots for each extruder. The first slot is set with K and the second slot is set with L, then select the first using S0 and the second using S1.

Notes

See Linear Advance for details on how to determine the K factor and a link to our calibration tool.

Usage

M900 [K<kfactor>] [L<kfactor>] [S<slot>] [T<index>]

Parameters

[K<kfactor>]

The K factor to set for the specified extruder. Unchanged if omitted. Set this value higher for more flexible filament or a longer filament path.

With EXTRA_LIN_ADVANCE_K this sets the primary K factor. Note that this factor may be inactive and won’t take effect until the next M900 S0.
    2.0.0[L<kfactor>]

    Set the second K factor for the specified extruder. Requires EXTRA_LIN_ADVANCE_K. Note that this factor may be inactive and won’t take effect until the next M900 S1.
      2.0.0[S<slot>]

      Select slot and activate the last stored value. Requires EXTRA_LIN_ADVANCE_K.
        2.0.0[T<index>]

        Extruder to which K, L, and S will apply. Requires EXTRA_LIN_ADVANCE_K.

          Related Media

          Examples

          Fetch the K factor

          M900

          Set the K factor

          M900 K0.18

          Disable Linear Advance

          M900 K0

          EXTRA_LIN_ADVANCE_K adds an extra storage slot.

          M900 S0            ; Select main K factor and apply it
M900 T2 K0.22 L0.4 ; Set both T2 K factors. K0.22 will be applied.
M900 T2 S1         ; Select extra K factor. L0.4 will be applied.
M900 T2 S1         ; (does nothing this time)
M900 T2 L0.3       ; Set T2 extra (and active) K factor
...
M900 T2 S0         ; Select main K factor (0.22)