The Cobble Gen Upgrade is an item in Progressive Automation. It can be installed in the Miner and will cause the miner to automatically generate Cobblestone blocks if it does not contain any. Each generated block of Cobblestone will consume 1 point of Pickaxe durability. Additionally, installing a Cobble Gen upgrade alters the Miner GUI, creating an image on the left side showing Lava, Water, and an arrow connecting them and pointing to the right.
When a machine is picked up with a PA Wrench, consumed upgrades are retained in it. When a machine is broken otherwise, all installed upgrades drop as items.