Interlocking Puzzle | The Keystone

Interlocking Puzzle: The Keystone

Test your wit and patience with The Keystone , a deceptively simple-looking interlocking block puzzle designed for 3D printing.

The challenge is simple but satisfying: transform 12 separate blocks into a single, solid geometric object. While 11 of the blocks are identical and easy to piece together, the structure remains incomplete and unstable until you introduce the 12th piece— The Keystone . Featuring a strategic cutout, this final block is the literal "key" that slides into the crux of the puzzle, locking all other components into a rigid, unified shape.

How it Works

- The Build: Assemble the first 11 identical pieces to form the shape. - The Crux: Find the specific orientation and path required to slide the Keystone into place. - The Result: A perfectly interlocked desk trophy that won't fall apart until you remove the key. Puzzle Specs

- Difficulty: 2/5 - Estimated Solve Time: about 60 minutes - Parts: 12 total (11 Identical Blocks, 1 Keystone) Print Instructions: No supports required! I recommend printing in two high contrast colors.