Mini caves within this 4.4 cubic ft cave would mean less room for cheese! And that is what it it all about! These wheels all range between 3 and almost 7 pounds! Finding mini cave containers would be difficult.
However... I think I have an improvement, courtesy of Yoav (Iratherfly) and an old post I found. I hung a piece of cheesecloth on the back cooling plate inside the cave. Then using an aquarium pump to push air from outside the cave, I put the end of the tubing coming out of the pump through the frame of the door, and behind the sheet of cheesecloth. I am not sure what aspect of this is helping, but I am now about 80 to 85% humidity.
I will keep an eye on it and update!