I've been playing with the mod ProjectE (a remake of Equivalent Exchange 2) and one of the items you can craft is an energy condenser which converts light into energy which it can store or convert into items. I'd like to be able to limit the number of condensers that can be crafted to keep the players from simply making unlimited diamonds from thin air. Is there an item parameter, a command, or a mod, that can limit the existence of a certain item to, say one in the entire world (or even one in the loaded chunks), and any crafting attempts to make more simply won't work, or better yet, give a different result.

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