Duper-Based Designs

Every build under this tag relies on a duplication mechanic, most often TNT duping, which clones primed TNT for free explosives. That free power is what drives TNT tree farms, world eaters, tunnel bores and the quarries that dig perimeters, plus sand and gravel dupers built around the End portal.

Know where you stand before building one. TNT duping is a bug that Mojang has deliberately left in Java until a replacement exists, and the technical community treats it as a quasi-feature; it does not work on Bedrock, and many servers, including Paper by default, patch or forbid it. So these designs are Java-only, version-pinned, and worth checking against your server's rules first.

Where dupers are welcome, they power the most efficient machines in the game. Preview each one layer by layer in 3D, read the listing's priming notes before you paste, and download free.