This SSBB papercraft is the Motion-Sensor Bomb, this paper craft is designed by lorsio. The Motion-Sensor Bomb is an item used in the Super Smash Bros. series. Various versions of the item have appeared in the series, but they all function similarly. Once used, the bomb is set on the ground or another surface until someone gets close enough to it, causing it to explode.
In the first game, it was based on the Proximity Mine that appeared in Rare, Ltd.'s GoldenEye 007.
In the Japanese version of Super Smash Bros. Melee and beta versions of the American localization, the Motion-Sensor Bomb is actually a Proximity Mine from Perfect Dark. However, in the final American version, it is still the Proximity Mine from Goldeneye 007. In Super Smash Bros. Brawl, the Motion Sensor Bomb is a unique design; Nintendo could no longer use the designs from Goldeneye 007 or Perfect Dark because they belong to Rare, Ltd., and the game was made after Rare was acquired by Microsoft. In Super Smash Bros. Brawl, unlike in the previous games, the Motion-Sensor bomb can disappear in a set amount of time, hindering its effectiveness.
You can download this SSBB paper craft from here: Super Smash Bros. Brawl (SSBB) - Motion-Sensor Bomb Free Papercraft Download