NOTE that this model has the cage and nugget both printed in plastic. Please order a metal nugget here
Nugget is a take-apart puzzle. The object is to remove the gold nugget from its cage. However, the nugget fits only through one of the holes and in only one orientation.
Nugget is based on a rhomic isocahedron, which has 120 isometric orientations. The frame has 6 holes. And out of those 720 combinations, there is only one where the nugget fits through the hole.
Watch the YouTube video
Read at the Shapeways Forum
Read more at the Non-Twisty Puzzles Forum