This is my original design for a micro-sized fast cobblestone generator. Here are the details:

- 3x3x3 size (not including the trapdoors to keep the water from flowing out)
- Generates one cobblestone every 9~10gt
- Linearly expandable WITHOUT needing to rebuild the gearing/circuitry (only takes a pump, hopper, pipe, and clipper block to expand - see photo)
- AUTOMATIC SHUTOFF: when the built-in storage becomes full, the machine shuts itself off. When it has been emptied down to a user-defined percentage, it will automatically turn itself back on.

I hope this helps people with their cobblestone needs!