Hyperboloid Burr Puzzle

DESIGNER: Oskar van Deventer, Naoaki Takashima MATERIAL: Brass SIZE: 1.65” (4.2 cm) The Hyperboloid Burr is a very fun six-piece burr puzzle made from identical hyperboloid pieces, designed by Oskar van Deventer and Naoaki Takashima. The puzzle has two solutions. The six-piece version is a put-together that assembles and displays well, but if picked up by a single piece falls apart under its own weight. The seven-piece solution is completed with a satisfying "click" and holds together well.Both assemblies are made possible by machining to very accurate tolerances. A mere 0.03mm variance and the seven-piece version of the puzzle either does not assemble or falls apart!Product pictures contain no spoilers; neither the six nor seven-piece assembly is shown. This puzzle ships disassembled.  Puzzle Mad wrote a very nice blog review, Mr. Puzzle's video can be found here (WARNING: Blog contains solution spoilers) Handling Metal PuzzlesAll metals tarnish over time. Residual oil a