86 lines
2.4 KiB
Markdown
86 lines
2.4 KiB
Markdown
---
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tag: m0900
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title: Linear Advance Factor
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brief: Get and set Linear Advance K value
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author: thinkyhead
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requires: LIN_ADVANCE
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group: control
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codes: [ M900 ]
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notes: See [Linear Advance](/docs/features/lin_advance.html) for details on how to determine the K factor and a link to our calibration tool.
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parameters:
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-
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tag: K
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optional: true
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description: |
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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.
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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`.
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values:
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-
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tag: kfactor
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type: float
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-
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tag: L
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since: 2.0.0
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optional: true
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description: 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`.
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values:
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-
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tag: kfactor
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type: float
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-
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tag: S
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since: 2.0.0
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optional: true
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description: Select slot and activate the last stored value. Requires `EXTRA_LIN_ADVANCE_K`.
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values:
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-
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tag: slot
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type: int
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-
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tag: T
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since: 2.0.0
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optional: true
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description: Extruder to which `K`, `L`, and `S` will apply. Requires `EXTRA_LIN_ADVANCE_K`.
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values:
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-
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tag: index
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type: int
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videos:
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- n3yK0lJ8TWM
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- _BiqlXPPfu4
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examples:
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-
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pre: Fetch the K factor
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code: M900
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pre: Set the K factor
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code: M900 K0.18
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-
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pre: Disable Linear Advance
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code: M900 K0
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-
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pre: "`EXTRA_LIN_ADVANCE_K` adds an extra storage slot."
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code: |
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M900 S0 ; Select main K factor and apply it
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M900 T2 K0.22 L0.4 ; Set both T2 K factors. K0.22 will be applied.
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M900 T2 S1 ; Select extra K factor. L0.4 will be applied.
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M900 T2 S1 ; (does nothing this time)
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M900 T2 L0.3 ; Set T2 extra (and active) K factor
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...
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M900 T2 S0 ; Select main K factor (0.22)
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---
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This command sets and/or reports the Linear Advance K factors.
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Setting the K factor to 0 disables Linear Advance.
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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`.
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