Bill Cutlers Classic Six-Piece Burr
thingiverse
This is supposed to be the most advanced six-piece puzzle, originally designed by Bill Cutler: http://billcutlerpuzzles.com/stock/baffling.html. You will need five precise moves to remove the first piece successfully. Bill Cutler created this challenging puzzle with great care and attention to detail. It's available online for anyone to try and solve. To help you understand the puzzle better, the original design was made using FreeCAD 0.17, an unreleased version of the software at that time. If you want to make any modifications or changes, you can download the original FreeCAD file from the same website. The cube size and tolerance levels are easily adjustable through a spreadsheet provided by Bill Cutler himself.
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