|First appearance||"Benderama" (6ACV17)|
The Banach-Tarski Dupla-Shrinker is a machine invented by Professor Hubert J. Farnsworth. Its original purpose was to create smaller duplicates of the Professor's sweaters, since as he gets older, he also gets shorter and colder. In order to work, one must scan the object with it, and insert a sufficient amount of solid matter for it to use to make duplicates of the object, which are supposedly 60% the original object's size.
Bender Bending Rodriguez installed the Dupla-Shrinker into his chest cavity, and used it to make two smaller duplicates of himself, after eating some matter. The duplicates then made two smaller duplicates of themselves, each, making seven Benders. Eventually, the Earth became infested with quintillions of nano-sized Benders, each with their own Dupla-Shrinker. They all leave Earth, after being forced to help the original Bender defeat the Unattractive giant monster, because they decided that there was too much work to be done on the planet.
- It is named after the Banach-Tarski paradox.