This is an Iron Man Mark VI armor mini papercraft, a test model, constructed in the wake of heavy damage sustained to the fourth and fifth generation Iron Man armors, the paper toy created by Gus Santome.
The Mark VI suit first saw battle against a small force of robot drones and the remotely controlled War Machine armor, before being worn in battle against Ivan Vanko in a battlesuit of his own. It later sustained moderate damage battling Thor and was then ravaged by multiple collisions with a S.H.I.E.L.D. Helicarrier fan. Despite this, the MK VI Iron Man suit was intact enough to continue limited service with a little repair work, although significantly impaired. It was retired shortly thereafter, being replaced by its successor, the MK VII.
The Mark VI armor was created by Tony Stark to replace the Mark IV armor when it was discovered that the Arc Reactor could be powered by vibranium, which did not wear out or poison the user. It is similar to the Mark IV in appearance except for the triangular chest piece. Stark developed the new core via building a particle accelerator, then superheating the primary triangular core to a white arc, creating a source acceptable for the Arc reactor.
You can download this papercraft template here: Iron Man Mark VI Armor Mini Papercraft Free Download