I have had a Barista Express for a few years now which I must admit Isn't used daily. Occasionally for a quick coffee I use an Aeropress and have a small hand grinder for that purpose. However due to shoulder injury using the hand grinder can be quite painful. Is is safe to use the Sage occasionally as a grinder on its own. I don't leave the water tank filled when not in use, but I don't know if there is a safe setting that will let me put a hand full of beans in the hopper to grind. Or is buying a separate grinder the best idea.