In some cases it can be convenient to add a pause in the gcode of the print-file. For instance to manually add something to the print, like an insert or continue with a different color at a certain layer.

To do that you can use the following commands.

M600 , this start the filament change routine. It will move the head to the side and you can change filament.

Or

M601 S<1/0> B<1/0> P<1/0>,This pauses extruders. B1 also pauses heated bed. Paused extrudes disable heaters and motor. Continue (S0) reheats extruder to old temp. P0 does not wait for target temperature.