Minecraft wiki entry for Block_and_item_duplication, associated text: You can also use autoclicker with these settings: time between clicks- 1sec 487milisecs. Then you bind the autoclicker to key n, and automine to key m and press n,m,right click at the same time. This opens shulker. Hover over item you want to duplicate - shulkerbox should break and item in it, and item on the ground.