Pause through AM, eject through Robox, unpause on AM?
Definitively clever use of it an pause and replace materials.
Now thinking of it – it would be nice (read it as a feature request) to have M command in set of printer commands that would do nothing but pause and waiting for resume option. That way you can build it in (g) program sent to the printer. One wouldn’t need to sit and wait for printer to start printing next layer to change materials.