Duplicatory

All you need is 8 cyan dye and a chest. It really pretty simple.\

Yeah, I could have made it take diamonds, or diamond blocks, or anything like that. But the point is that it's an early-game, simple, overpowered way of killing the grind for materials. Besides, cyan dye is a bit harder to come across than you might think.

The Duplictory's GUI looks like a normal chest, except for a massive button at the bottom that says "duplicate." When clicked, any item in the chest will instantly be doubled!

Including unstackable items. Oops... I might fix that one day.

Besides the fact that it appears to be the only duplication mod for recent versions, the Duplicatory is easier to figure out than a lot of other mods. It's a chest with a big button, what more do you need? Plus, the Duplicatory acts as a regular chest, too (hence the name Duplicatory). Not sure why you'd need that if you have infinite chests, but hey, it works. 

Absolutely! That's what this mod is for, after all: Annihilation of the early- and late-game grind of many mods. In fact, you don't even need to credit me (although I'd still like it).

Absolutely not. In no circumstance can you ever repost someone's mod unless they give direct permission!

I know, I know - this is a very annoying message. But it's important!