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A 3-piece burr that will take most people 2 to 30 minutes to assemble.  It fits in a 4 cm cube, so it prints quickly.  A nice puzzle to give away at parties or for kids.

The original wood version (seen in the photos) was made by Wayne Daniel. I suggest printing first the 10 version of this puzzle, which is looser (offset 0.1 mm).  The 05 version has a perfect fit on my printer, it has an offset of 0.05 mm.

This is a common model and I have seen identical versions on printables.

BurrTools export parameters: Unit size: 5.08 mm (1/5 inch); Bevel: 0.5 mm; Offset 0.10 mm or 0.05 mm. Printables won't let me upload the BurrTools file.