Adding M600 to change filament to Gcode

[tsteever]

Roxy, do you just add them in? Just a M600? Do you need to be mindful where to put them? I am thinking I am just not getting the sequence correct. I want to add a M600 right before the fill is printed on my top layer and then add another m600 to switch back before the next layer begins. Here is the order I'd like to print...

Print begins and prints beginning layers.
Print begins layer 8 and prints the permineters
M600
Print resumes layer 8 and prints fill
M600
Print resumes and moves to layer 9
Prints perimeters
M600
Prints fill
M600
Prints next layer and finished print