How to Make a Cobblestone Generator in Minecraft : 4 Steps - Instructables
How to create a simple cobblestone generator in minecraft - B+C Guides
How to Make a Simple Automatic Minecraft Cobblestone Generator! - Instructables
1.14.4] Why does this cobblestone generator not work? this design used to work fine but whenever i do it nowadays the water flows too fast and turns the lava to obsidian :