Interlocking Puzzle | The Keystone — STL Grátis

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.

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