Automation · Resource Farm · Java & Bedrock
How to Make a Cobblestone Generator
Where flowing lava meets watera block of cobblestone is born. Break it and it comes back, so two buckets give you endless stone.
∞ COBBLE
lava meets water
a new cobble formsWhere flowing lava and water touch, a fresh cobblestone is born in the gap. A piston breaks it loose into a chest and another forms instantly, so you get endless cobblestone.
What you need
A lava source
A water source
A piston to break it (auto)The endless cobblestoneLava plus water equals cobble
The rule is simple: flowing lava touching water turns into cobblestone in the block between them. Mine that block and the lava flows back in, hits the water, and makes another, forever. Swap your pickaxe for a piston on a clock and let water wash the drops to a chest, and the generator runs itself.
Quick answers
What is a cobblestone generator in Minecraft?
It is a tiny build that makes cobblestone out of nothing but lava and water. Where flowing lava touches water, a block of cobblestone forms in the gap. Break it and another appears, so you get an endless supply from two buckets.
How does a cobblestone generator work?
Flowing lava and water meet in a single empty block. The contact turns the lava into cobblestone in that gap instead of into obsidian or stone. Mine the cobblestone and the lava flows back in, touches the water again, and regenerates the block.
How do you build a basic cobblestone generator?
Dig a small channel with a one-block gap in the middle. Put a water source on one side so it flows toward the gap, and a lava source on the other side flowing into the same gap from the opposite direction. Cobble forms in the gap; stand beside it and mine.
How do you make a cobblestone generator automatic?
Replace your pickaxe with a piston. Fire the piston on a clock to break the cobble, let a water stream wash the drops to a hopper and chest, and the block regenerates between pulses. Larger flying-machine farms mine huge fields of it at once.
Why do I get obsidian or stone instead of cobblestone?
It depends on what touches what. Flowing lava meeting water makes cobblestone, which is what you want. Water dropping onto a lava source makes obsidian, and some setups make stone, so keep the lava flowing into the gap rather than sitting as a source under the water.
Does a cobblestone generator work on Bedrock?
Yes. Lava meeting water still makes cobblestone, so the basic generator is identical, though fluid flow and redstone timing differ a little, so an automatic Java design may need its piston timing adjusted on Bedrock.