Minecraft- Fastest Cobble Generator Tutorial! [1.12 Ready]

Hello everyone! In my SkyBlock lets play I was challenged to make the fastest cobblestone generator possible, and this is what I came up with! Of course you can make this design in Minecraft PC, Xbox, Play Station, Pocket Edition (any version that uses pistons)\r
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At 138 cobblestone [or 2.2 stacks] per minute, this machine is the best of its class! Not to mention that the cobble is automatically collected. Enjoy!\r
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I also designed a stone generator! This one collects 700+ stone per minute, nearly 4 times as much as this design: \r
There is an updated design for this generator as well, check it out here: \r
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