title_body: What are some strategies for handling the transition between different-aged beans in a coffee shop Espresso grinder?
upvoted_answer: You will just have to find some form of compromise. I think the best way would be to empty the Hopper and then fill it with the new beans (also sometimes you might want to switch up the espresso?). You should figure out how your grinder behaves once it's getting more empty and with this knowledge you can quite easily adjust the extraction such that the quality will not decrease too much.
  
  The most likely case is that the dose will decrease slightly. You could put a scale next to the hopper and if you feel like your espresso is running faster, check if the dose changed because the hopper is getting empty and adjust your grinder accordingly. I think checking the dose and grind occasionally throughout the day is a good way to up your espresso game in any case. It helps me learn a lot about the coffee and setup. There's tons of variables, like humidity and temperature that will change the behavior of the grinder.