A string duper is a contraption in Minecraft that allows players to duplicate string, a valuable resource used for various crafting recipes. String can be obtained by killing spiders, but it is a rare drop, making string dupers a useful way to acquire large quantities of the item.
String dupers work by exploiting a game mechanic that allows items to be duplicated when they are dispensed into a hopper that is already full. To create a string duper, players will need a dispenser, a hopper, a chest, and a redstone clock. The dispenser is placed on top of the hopper, which is placed on top of the chest. The redstone clock is used to activate the dispenser, which will dispense string into the hopper. If the hopper is already full, the string will be duplicated and sent to the chest.
