I've been searching through the documentation but I can't see how to issue gcode commands directly to the printer. For example, I'd like to do something like this:
def some_func():
   printer.command("M80")   # pseudo-code
Is there a mixin or anything to do this?  I see there's an octoprint.printer.factory but I'm not really sure if it's what I'm looking for or how to use it.