Arming the People
I started with the key. I placed the key into one chamber in the replicator and a massive bar of gold into the other. When you put too high of a value item into the exchange chamber, it simply replicated the item as many times as the value of the item placed in the chamber would cover.
In this particular case, it covered a dozen copies of the key. There was a small chunk of gold left in the chamber next to all the copies of the key. I removed the key copies and kept the gold in the chamber for future replications.
I did the same with the portal compass and the dungeon glasses. The replicator would increase and decrease in size based on how large the item being replicated was combined with how many copies were being replicated.
It basically sized itself to fulfill the job it needed to. Nothing complicated about that. Fancy, but not complicated. I made dozens, then hundreds, then thousands of copies of the 3 dungeoneer items necessary for people to tackle the dungeons.