Add M306 documentation

_gcode/M306.md

@@ -0,0 +1,95 @@
+---
+tag: m0306
+title: Model predictive temperature control
+brief: Set MPC values for a hotend.
+author: CRCinAU
+
+requires: MPCTEMP
+group: thermal
+since: 2.0.9.4
+
+codes: [ M306 ]
+
+notes:
+  - Requires `MPCTEMP`.
+  - View current values with [`M306`](/docs/gcode/M306.html) and no parameters.
+  - If `EEPROM_SETTINGS` is enabled, all calibration values are saved with [`M500`](/docs/gcode/M500.html), loaded with [`M501`](/docs/gcode/M501.html), and reset with [`M502`](/docs/gcode/M502.html).
+  - Heater Power (P) is related to the heater cartridge in the hotend. Most printers have 30 or 40 watt heaters.
+  - '`M306 T` will move your hotend to 1mm above the bed for optimal calibration. You should ensure your hotend and print bed are free from debris before running an auto-tune.'
+
+parameters:
+  -
+    tag: A
+    optional: true
+    description: Ambient heat transfer coefficient (no fan).
+    values:
+      -
+        tag: value
+        type: float
+  -
+    tag: C
+    optional: true
+    description: Heatblock Capacity (joules/kelvin)
+    values:
+      -
+        tag: value
+        type: float
+  -
+    tag: E
+    optional: true
+    description: Extruder number to set. (Default: E0)
+    values:
+      -
+        tag: index
+        type: int
+  -
+    tag: F
+    optional: true
+    description: Ambient heat transfer coefficient (fan on full).
+    values:
+      -
+        tag: value
+        type: float
+  -
+    tag: H
+    optional: true
+    description: Filament Heat Capacity (joules/kelvin/mm)
+    values:
+      -
+        tag: value
+        type: float
+  -
+    tag: P
+    optional: true
+    description: Heater power in watts
+    values:
+      -
+        tag: value
+        type: float
+  -
+    tag: R
+    optional: true
+    description: Sensor responsiveness (= transfer coefficient / heat capacity).
+    values:
+      -
+        tag: value
+        type: float
+  -
+    tag: T
+    optional: true
+    description: Autotune the active extruder.
+
+examples:
+-
+  pre: 'Configure MPCTEMP for 40W hotend heater'
+  code:
+    - M306 P40
+-
+  pre: 'Configure MPCTEMP for 70W hotend heater'
+  code:
+    - M306 P70
+-
+  pre: 'Perform MPCTEMP auto-tune - after setting heater element power'
+  code:
+    - M306 T
+---