Dudd / Missing Notches - Interlocking puzzles by Stewart Coffin (STC #129 / 129-A)

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<h3>Dudd / Missing Notches</h3><h4>Interlocking puzzles by Stewart Coffin (STC #129 / 129-A)</h4><p><i>Dudd</i> and <i>Missing Notches</i> are two closely related puzzles by Stewart Coffin. Both have the same objective: assemble six burr pieces into the configuration shown in the first photo. Enthusiasts of interlocking puzzles will recognize this shape as the standard six-piece burr assembly, featured in many other puzzles, such as the <a href="https://www.printables.com/model/171050">Starter Burr Set</a>. <i>Dudd</i> and <i>Missing Notches</i> have a twist, though: the pieces have confusing diagonal cuts that make the assembly very tricky and unusual.</p><p>Coffin wrote: "The name <i>Dudd</i> is perhaps misleading (as well as being misspelled). The idea for this puzzle came from a similar one that Bill Cutler designed many years earlier. His looks like an ordinary six-piece burr except that each piece has a pair of additional diagonal notches. Half of those notches are unnecessary, and so <i>Dudd</i> has only six, and is thereby much trickier to assemble.</p><p>"[<i>Missing Notches</i>] is similar to <i>Dudd</i> but has ten diagonal notches instead of the required minimum of six, for added confusion. The idea behind the name was to suggest that I was trying to make the Cutler version but left out two notches by mistake. Some got it, some didn’t."</p><h4>Printing Instructions</h4><p>Print copies of <code>coffin.dudd.piece-1.stl</code> and <code>coffin.dudd.piece-2.stl</code> as follows, depending on which version of the puzzle you wish to make. You will need to use supports for <code>coffin.dudd.piece-2.stl</code>, but the supports are necessary only for the tip of the diagonal at the base of the piece, so they should remove cleanly without scarring. (Make sure you use a support overhang threshold of less than 45 degrees, to ensure that supports are <i>not</i> generated along the sides of the diagonal.)</p><ul><li><i>Dudd</i>: Print six copies of <code>coffin.dudd.piece-1.stl</code>.</li><li><i>Missing Notches</i>: Print two copies of <code>coffin.dudd.piece-1.stl</code> and four copies of <code>coffin.dudd.piece-2.stl</code>.</li></ul><p>It is also possible to print the following additional variants.</p><ul><li><i>Missing Notch</i>: Print one copy of <code>coffin.dudd.piece-1.stl</code> and five copies of <code>coffin.dudd.piece-2.stl</code>. This variant was not mentioned by Coffin in AP-ART, but has been proposed by Coffin and Eric Fuller and made in wood by Fuller.</li><li>Bill Cutler's original version (easier): Print six copies of <code>coffin.dudd.piece-2.stl</code>.</li></ul><p>All of the variants have essentially the same solution, but the variants with mixed pieces (<i>Missing Notches</i> and <i>Missing Notch</i>) are more confusing, and therefore more challenging.</p><h4>The Printable Puzzle Project</h4><p>The <a href="https://www.puzzlehub.org/ppp">Printable Puzzle Project</a> aims to make available high-quality open-source models of many puzzle designs. All of our models are posted with the generous permission of their designers and are licensed for <strong>non-commercial use only</strong>. Anyone may print copies for their own personal use, but selling or otherwise monetizing them is not permitted, and puzzle designers retain all rights as copyright holders of their work.</p><p>Our puzzles are modeled using the open-source <a href="https://www.puzzlehub.org/puzzlecad">puzzlecad</a> library. The <code>.scad</code> file is included with this model in case you want to modify any of its design parameters; more information on how to do this can be found in the PPP <a href="https://www.puzzlehub.org/tutorials/puzzle-modeling">Puzzle Modeling tutorial</a>.</p><h4>About the Designer</h4><p>Stewart Coffin has been called "the most outstanding designer and maker of interlocking puzzles that the world has ever seen". He is credited with over four hundred designs, has pioneered numerous ingenious puzzle forms, and has written extensively about puzzle design and craftsmanship. More information on Coffin, along with many other printable models of his designs, can be found on the <a href="https://www.puzzlehub.org/puzzles/stewart-coffin">Stewart Coffin Puzzles</a> overview page.</p><p>Happy puzzling!</p>