Having Ring of Magnetisation II (from Extra Alchemy) equipped, while mining any placeable item that sits on a hopper, gives you that item in your inventory, while also sending one down the hopper line. I've duplicated quite a few Drying Basins by accident.
Seems to work with anything you can place on a hopper - confirmed with cauldron, log, soul sand, Ritual Table and block of Amethyst, as well as Beacon I cheated in for testing.
Having Ring of Magnetisation II (from Extra Alchemy) equipped, while mining any placeable item that sits on a hopper, gives you that item in your inventory, while also sending one down the hopper line. I've duplicated quite a few Drying Basins by accident.
Seems to work with anything you can place on a hopper - confirmed with cauldron, log, soul sand, Ritual Table and block of Amethyst, as well as Beacon I cheated in for testing.