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Hole In None Puzzle

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3D model description

This is a remake of a wood puzzle designed by Stewart Coffin 25 years ago. Stewart found 3 identical pieces that assemble into a rhombic dodecahedron. Although the pieces go together with coordinate motion, they can do this in more than one way. The net effect is that the puzzle is loose and just falls apart. To improve this he added a peg in one piece and a hole in another, creating a coordinate motion puzzle he called "Hole In One", Stewart Coffin's design #52A . The peg "fixes" the coordinate motion because it constrains two pieces to move directly away from one another.

My idea is to stellate the rhombic dodecahedron. There are several ways to extend the pieces. One way is to use the "HIO" piece in the Stellated Orchid puzzle. I printed three of these and discovered it had the same problem as Stewart Coffins original: it is loose and falls apart.

Alternatively, it is possible to add the stellated parts so that they force two pieces to move directly apart, filling the role of the peg and hole. Since this change removes the hole, it seemed strange to call it a "Stellated Hole In One". So I call it "Hole In None".

Print one copy of "HIO4a" and two copies of "HIO4b". These pieces do not need supports. On my printer, this puzzle came out tighter than the Stellated Orchid, I have given the pieces with offset 40 microns only.

This is the fourth iteration of this design. You can print out three copies of "HIO4A" and it will also go together, but it suffers the same problem as the original puzzle. It will seem loose.

  • 3D file format: STL





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