interlocking cube puzzle 3d model

A mechanically precise 3-piece interlocking cube assembly. The cube is divided into three equal-volume parts, each uniquely shaped but forming a perfect cube when assembled. Each piece features a sophisticated interlocking geometry that allows assembly through a combination of sliding, rotating, and sequential insertion movements. The locking mechanism is decentralized, meaning no single central joint; instead, each piece contributes to the overall structural stability. The pieces should include internal channels, notches, and hidden grooves that enable them to slide past one another in a specific order. The assembly sequence must be non-trivial: one piece acts as a key piece that must be inserted last, locking the entire structure. The other two pieces should partially interlock first through a guided sliding motion, followed by a rotational alignment that creates space for the final piece. Each component should appear visually simple from the outside (minimal clues about assembly)