Here are my 2¢ on the used/unused thing...
Like the dual, I assume that the Square having multiple chambers is not just for the sake of capacity, but for variety. You might want to have different strains or even concentrates in different chambers. This completely negates the "only turn in one direction" system as you might want to skip to different chambers for different uses.
Of course, I have no idea what the electronics of the Square are; will it even have a screen, etc. But, my feeling is that to implement a good used/unused system, the Square needs to have a method to keep track of which chamber is which. That's easy enough with a multitude of strategies, be they mechanical, optical, electrical, etc. But then there needs to be a way for the user to specify if the chamber is empty, full, or used, because I don't see a feasible way for the Square to know that itself (just because you have rotated to a particular chamber and applied heat doesn't necessarily mean that the load is spent). One easy way would be to have a button and LED (or display on a potential screen) that the user could press to mark a chamber as empty/fresh/spent (different colors, like orange/green/red). When you rotate to another chamber, since it knows which chamber it is, it'll display the appropriate status previously set by the user. You would now know the status of that chamber, and if need be, update its status with the button. There could also be a reset button to clear the status of all chambers at once, perhaps located inside the loading section so it could only be pressed when the Square is open, to avoid accidental resets.
I think something like this would be cool and help differentiate the Square even more. But a used/unused system could be as simple as colored dots on either side of a reversible pod -- definitely not as cool or convenient, as you would have to keep opening the Square to check.
What do you think,
@scottg402 ?
