- Go to any map with the NPC Mimi, the 7th Day Market NPC (May be found in The Burning Road: Ariant, Henesys, Lith Harbor, Orbis, or Leafre)
- Type @save and then drop the item that you want to duplicate.
- Talk to Mimi and go into the 7th Day Market.
- Either change channels (then change back), relog, or go to the cash shop.
After you've done this you should end back up where you dropped your items with the items on the floor AND in your inventory if you did this correctly (provided it's not patched). There's no packet editing involved unless you need to drop an untradable item. Enjoy!
Credits go to @iAngeIiK
Best watched in Full Screen + 480p