Finding a key in MW4 DMZ is a guaranteed way to get weapon manuals, recipes, and perhaps even another legendary weapon for your stash. There are dozens of keys that unlock unique secret locations around Hajin, so if you have one and want to use it, consult the table below to find every key and its location in DMZ!

There are over 107 recipes for the 3D Printer in MW4 DMZ. Here's where to find them all and the ingredients you will need to craft them.

In the basement of the Blackmarket in the east area of Hanrim Village.

On Floor 3 of the building east of the NuriGO Mall Gas Station.

Inside the basement of the Gas Station in the south area of the Construction Zone, just southeast of The Grid.

West of the Police Station in the Cheongun Village in the basement.

Inside the classroom on the second floor of the school in Deadtown, north.

Inside the Art Records Room on the first floor to the east.

Inside the building south of Reactor 02 in the Hanuel Nuclear Reactor.

Inside the first floor of the Rice Mill in the Imjin Farmland, east area.

On the bottom floor of Gangbyeon Apartment B in Compound Echo, Hajin River Heights.

Next to the crab stall in the southeast area of Songdo Wharf.

Basement of the building between the Gas Station and Fire Station in the Cheongun Village.

Second floor of the military repair garage in the center of the Cheong-san Air Base.

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