介入 - 斯圖爾特·考芬的互鎖謎題（STC #214）

Involute Interlocking puzzle by Stewart Coffin (STC #214) Assemble the eight pieces into a 4x4x4 cube. Involute is the third and final entry in Stewart Coffin's classic trilogy of interlocking cube puzzles. It is a refinement of his earlier desig, Convolution and Involution. A masterpiece of design ingenuity, Involute (along with Involution) involves "coordinate motion of a most baffling kind" (Coffin's words) that, as far as I know, remai unique. UPDATED March 2020 with a new design and larger size. Printing Itructio Two veio are provided, a four-color veion and a single-color veion. The multicolor veion uses "snap joints" to enable each piece to be printed in several components with different colo (see below for details). It's the preferred veion and is the one shown in the photo. The single-color veion lacks the aesthetic properties of the multicolor one, but it is designed to be relatively easy to print. To print the four-color veion, print through each in a different filament color; colo 1 through 3 will appear on the "windmill" patter on the cube faces, and color 4 will appear on the corne. You can also print a two-color veion by using the same color for color-1 through color-3. To print the single-color veion, print . There is also a smaller variant provided, , which will use around half as much material. After you print it, fit connect all the joints before attempting to solve the puzzle. Snap each male connector into a corresponding female connector (for example, the male connector labeled "A" should connect to the female connector with a matching "A" label on the interior). The joints are designed to be tight, and depending on the printer and filament used, you may need to hammer them into place. If they come out too loose, a drop of superglue will make them more solid (in most cases this shouldn't be necessary, but unfortunately tolerances vary across printe and filaments). The snap joint concept is discussed further in this tutorial: Getting Started with Puzzle Printing. The Printable Puzzle Project The Printable Puzzle Project aims to make available high-quality open-source models of many puzzle desig. All of our models are posted with the generous permission of their designe and are liceed for non-commercial use only. Anyone may print copies for their own peonal use, but selling or otherwise monetizing them is not permitted, and puzzle designe retain all rights as copyright holde of their work. Our puzzles are modeled using the open-source puzzlecad library. The .scad file is included with this model in case you want to modify any of its design paramete; more information on how to do this can be found in the PPP Puzzle Modeling tutorial. About the Designer 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 desig, has pioneered numerous ingenious puzzle forms, and has written exteively about puzzle design and craftsmahip. More information on Coffin, along with many other printable models of his desig, can be found on the Stewart Coffin Puzzles overview page. Happy puzzling!