Mortise-and-Tenon Interlocking Cube

        This is a six‑pillar, basic‑style mortise-and-tenon Lu Ban lock, assembled from three components. It relies entirely on the interlocking structure to self‑lock, requiring no glue or additional fasteners. The parts feature simple, well‑proportioned shapes, with meticulously adjusted mortise‑and‑tenon tolerances for smooth assembly and disassembly. It serves as both an educational tool for demonstrating mortise-and-tenon joinery and a delightful desktop stress‑relief ornament. Each piece has no overhanging sections, and the entire model was printed without supports, making it ideal for beginners practicing their skills or for high‑volume production. Once assembled, the cube stands squarely and stably, offering an excellent opportunity to experience the traditional logic of wooden interlocking joints. Assembly instructions are available in a video. All edges have been rounded to prevent cuts, ensuring safety—especially suitable for children.