New Menu Item to Load / Unload Filament

I was surprised to see that there was an option to have a menu item to toggle case led on/off. Cool.
I would like to see something similar for Load / Unload filament that basically heats up the head to xxx then extrudes or retracts yyyy length.

How do I add this to Marlin? Is it easy enough to do?

Edited 1 time(s). Last edit at 07/13/2017 09:10PM by Eddiie.

The code is not mature yet. But you might want to check out M701 and M702: [github.com]

I did it with a Gcode file than runs from SD card;

M109 S175 ; wait extruder temp reaches 175 for ABS
G91 ; relative coords
G1 E-20 F500 ; retract 20 slow f500= 8mm/s
G1 E-800 F6000 ; retract 800 quickly f6000= 100mm/s
M300 S300 P700 ; beeps
M18 ; disable steppers to allow pull out
G4 P10000 ; pause 10 secs
M300 S800 P300 ; beeps
G4 P300 ; pause 3rd secs
M300 S800 P300 ; beeps
G1 E770 F6000 ; forward 770 quickly f6000= 100mm/s
M18 ; disable steppers to alow push in
M104 S0 ; set extruder temp to 0
G92 E0 ; resets extruder position to 0
G90 ; set absolute coords

Quote
Eddiie
I would like to see something similar for Load / Unload filament that basically heats up the head to xxx then extrudes or retracts yyyy length.

How do I add this to Marlin? Is it easy enough to do?

You just need to enable this in Configuration_adv.h Specifically, turn on the #define ADVANCED_PAUSE_FEATURE and set the Filament change numbers to what you need. It should be in the LCD Menus at that point.