This incredibly impressive project allows you to print out any 3D object layer by layer in a 6x9x10 area.
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Pro Clever use of chests
You print out each layer by using a chest's 2D grid inventory which is really an ingenious way of using chests and speaks to the level of depth that can be found in the game.
Pro Has a practical purpose
Unlike many of the Minecraft projects that implement a simple CPU, this project actually has a practical use as you can actually build things out of it.
Con Objects are small
The objects created can only be 6x9x10 and while it's really cool that a tool like this can even be done in the game, the items are small and will only be of so much use.