---
tag: m0404
title: Filament Width Sensor Nominal Diameter
brief: Set the nominal diameter for filament width sensor auto-flow
author: thinkyhead

group: control
requires: FILAMENT_WIDTH_SENSOR

codes: [ M404 ]
related: [ M405, M406, M407 ]

parameters:

- tag: W
  optional: true
  description: The new nominal width value
  values:
  - tag: linear
    type: float

examples:
- pre: Set the diameter to 1.75mm
  code: M404 W1.75

- pre: Get the current width
  code:
   - M404
   - '> Filament dia (nominal mm): 1.75'

---

Set the Nominal Filament Width, such as 1.75 or 3.00. Send `M404` with no parameters to get the current value.

This value is used to determine the percentage difference when auto-adjusting flow in response to the measured filament width, and should match the value used for filament width in your slicer settings.
