Hoffman's "Nut" burr puzzle
thingiverse
The origination of this puzzle can be traced back to Hoffmann's 1893 book Puzzles Old and New, later featured in Martin Gardner's Scientific American column in the late 70s/early 80s. It was a popular pastime in my childhood, often made with balsa wood. Despite its now-familiar solution, it remains challenging. A disassembly video is available at http://youtu.be/8Efjz7pOQqU. The STL files for 3D printing offer a relaxed fit on the Cube printer by 3D Systems, with an extra 0.01" clearance. Blender files are provided for both the relaxed-fit pieces and the ideal-width ones. Don't forget to rotate pieces E and F flat before printing.
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