This is the simplest automatic stone generator that works in Vanilla or modded Minecraft. It works in all versions of Minecraft that have sticky pistons and repeaters and still works in the newest 1.12 snapshots!
There are other stone and cobblestone generators out there, but you will not find an automatic stone generator that's as simple and resource friendly as this one! This thing only uses 6 redstone dust and has no running clock circuit. I even have an open challenge to anyone who can find another stone generator design that's easier to build and use than this one. Cobblestone farming using an automated smooth stone generator is really this easy. You may want a simple compact auto stone generator with almost no lag for many situations such as UHC ultra hardcore, skyblock, adventure maps, super hostile, survival, vanilla, modded Minecraft and many more. This build isn't the fastest stone generator ever, but it is the easiest to build and use. Instead of cobblestone, you get smooth stone so it mines faster, or you can use a silk touch pick. For a compact stone generator, you can't beat the simplicity and ease of use!