The "3D Printer Tank" is a Regular Army vehicle introduced in Metal Slug Attack.
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This tank is an enormous 3D printer mounted on the chassis of a Slug Square. The 3D printer is linked through an AI and can materialize anything the AI desires. The Regular Army expected this tank to be highly destructive among its arsenal. Unfortunately, the AI the 3D printer is linked to, Phi, is extremely shy and does not want to go into battle.
Because of Phi's behavior, the tank is capable of generating constructs use for combat such as a protective shield that can absorb impacts and heal allies. Her shields can also deal contact damage both when intact and when shattered pieces of it fly onto enemy units.