This papercraft is Morph Ball (aka Morphing Ball), one of the most prominent, integral, and representative items of the Metroid video game series, the Alt-Form of Samus Aran, and allows her to turn into a sphere 0.8 meters in diameter, the paper model is created by Deepershade.
It allows her to enter small tunnels and openings, which often lead to previously inaccessible areas.
Morph Ball Mode is vital in defeating many bosses from the series, including Amorbis in Metroid Prime 2: Echoes and the Queen Metroid in Metroid II: Return of Samus. In non-Prime games, it usually plays an important role in escaping from enemies, such as in Metroid: Zero Mission. In almost every game, a combination of the Morph Ball and a Bomb is the only way to detach a feeding Metroid. In the three Zebes-based games, the item is almost immediately acquired after entering Brinstar. [Source: wikia]