(adsbygoogle = window.adsbygoogle || []).push({});1. Back up your main save on a USB.
2. Create a new user on your PS3 (You don't have to sign up for PSN)
3. Go on your main account and start Diablo 3
4. At main menu press start on your second controller and make a new profile under the name of the user you just created.
5. Drop anything you want to dupe on your main account and pick it up on your second controller. (Also you can dupe money by going to the party menu and press triangle to give money.)
6.Quit the game and reload the back up of your save.
7. Get back all items from second controller and you have successfully duplicated any item you want.