Tired of manually farming cobblestone? Need a lot of cobble but don't have much time to be active? Well, I made a proof of concept for a fully automated cobblestone farm using cobblestone generators, pistons, and a TNT duper.
Cobblestone from cobblestone generators is pushed into the path of falling TNT from a TNT duper, which blows up the blocks, causing them to drop down into the hoppers below, where they are funneled into a chest.
This farm requires no player action, so you can farm cobble while AFK, no paperweights attached!