This cobblestone generator is most powerful and most space efficient gen ever built. 100 cores generates 700 cobblestone in 10x10x7 block within 12 seconds. This generator will satisfy most cobble hungry players.

You will need only about 3 stacks of redstone for cirquit, and only 60 repeaters and just only 100 pistons and lava blocks. You might be able to mine about 4 blocks deep if you have best pick and haste 2. So you might need army of 25 players to mine this fast enough.

It also will provide lag by powering 100 pistons at same time, so make sure you put your antilag goggles on before you attempt to pull the lever.

UPDATE: It now fits in 1 chunk. Starts faster. Further piston sync improvements.

The new dimensions is 16x16x26. Enjoy the LAG! ( Now generates double headed pistons on outer bottom ring corners)

New= You can now instantly paste this generator where ever it is needed, without worry of water flowing inside the wiring. It still fits the chunk tho, but no exposed redstone under level of floor.