Filament Change Script issues.

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When you implement the Filament Change script, there is an option for Initial Retraction and Later Retraction Distance and defaults to 30mm for Initial Retraction and 300mm for Later Retraction. Because most Firmware has the Filament Load and unload length configured in configuration_adv.h it would probably be better to set the defaults to 0 so that it will use the machine settings. (or better yet, a checkbox that allows the user to use the predefined machine settings, and if unchecked, THEN the Initial Retraction and Later Retraction distance options become available?)

It looks like the above is already implemented in the Master Branch

 

But the bigger problem is:

The Script for the Filament change will append the M600 code with an E option with the value of Initial Retraction which is correct.

The bigger problem is that the script will append the M600 code with an L option with the value of Later Retraction Distance. The L modifier is for the Load length not the additional unload length. The Modifier should be the U option and not the L.

Pull request submitted