Penta-Pentomino - Tray-packing puzzle by Stewart Coffin (STC #176-A)

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<h3>Penta-Pentomino</h3><h4>Tray-packing puzzle by Stewart Coffin (STC #176-A)</h4><p>Fit all five pieces into the square opening.</p><p><i>Penta-Pentomino</i> is one of a series of tray-packing puzzles by Stewart Coffin. It seems impossible at first, but it isn't... if it seems like the pieces just won't fit the way you expect, or the tray size is just a little bit off... don't worry! There's nothing wrong with the model or your printer. Keep trying. (The other puzzles in the series can be found on the <a href="https://www.puzzlehub.org/puzzles/stewart-coffin">Stewart Coffin Puzzles</a> collection page.).</p><p>This is an easily overlooked entrant in the series. Coffin himself didn't think especially highly of it: it's omitted from his canonical reference work <i>AP-ART</i>, and in his other writings it does not receive a name, appearing only as <i>No Name, No. 176-A</i>.</p><p>I think it certainly merits more attention! It's easier than most of his other puzzles in this series, making it an excellent "warm-up" before tackling the harder ones; and it has a pleasing structure, fitting five pentominoes - polyominoes with area five - into a perfect square. The name <i>Penta-Pentomino</i> has been used on the few occasions when this design was previously produced, and I certainly prefer it to <i>No Name, No. 176-A</i>.</p><h4>Printing Instructions</h4><p>Print one copy each of <code>coffin.penta-pentomino.pieces.stl</code> and <code>coffin.penta-pentomino.tray.stl</code>. Optionally, you may print <code>coffin.penta-pentomino.lid.stl</code> as well, which is a lid that fits over the tray for easy storage.</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>