---
tag: m0301
title: Set Hotend PID
brief: Set PID values for a hotend.
author: thinkyhead

requires: PIDTEMP
group: thermal

codes: [ M301 ]

notes:
  - Requires `PIDTEMP`.
  - View current PID values with [`M503`](/docs/gcode/M503.html).
  - If `EEPROM_SETTINGS` is enabled, all hotend PID values are saved with [`M500`](/docs/gcode/M500.html), loaded with [`M501`](/docs/gcode/M501.html), and reset with [`M502`](/docs/gcode/M502.html).

parameters:
  -
    tag: E
    optional: true
    description: Extruder index to set. Default 0.
    values:
      -
        tag: index
        type: int
  -
    tag: P
    optional: true
    description: Proportional value
    values:
      -
        tag: value
        type: float
  -
    tag: I
    optional: true
    description: Integral value
    values:
      -
        tag: value
        type: float
  -
    tag: D
    optional: true
    description: Derivative value
    values:
      -
        tag: value
        type: float
  -
    tag: C
    optional: true
    description: C term (requires `PID_EXTRUSION_SCALING`)
    values:
      -
        tag: value
        type: float
  -
    tag: L
    optional: true
    description: Extrusion scaling queue length (requires `PID_EXTRUSION_SCALING`)
    values:
      -
        tag: value
        type: float
  -
    tag: F
    optional: true
    description: F term (requires `PID_FAN_SCALING`)
    values:
      -
        tag: value
        type: float

examples:

---

Set the values that control the PID loop for a hotend.