Three Piece Block - Assembly Puzzle by Stewart Coffin (STC #38)

thingiverse

Three Piece Block is an assembly puzzle designed by Stewart Coffin. Assemble the three pieces into the pyramid shape shown in the photo. This puzzle is surprisingly difficult despite having only three pieces, due to its unusual shape. There are other models of Three Piece Block available on Thingiverse, but this one is the first that can be printed without supports. This print uses "snap joints" so it can be printed without supports. After printing, connect all the joints before attempting to solve the puzzle. Each half-cube with four protrusions snaps into a corresponding socket on one of the larger pieces. The joints are designed to be tight, and depending on the printer and filament used, you may need to hammer them together. If they come out too loose or too fragile, a drop of superglue on the base of the connector will make them more solid. The snap joint concept is discussed further in this blog post: [Adventures in 3D Puzzle Printing](https://normalplay.blogspot.com/2019/01/adventures-in-3d-puzzle-printing.html). This puzzle is modeled using [puzzlecad](https://www.thingiverse.com/thing:3198014), and the .scad file is included for remixing. You will need to use puzzlecad VERSION 1.1 OR LATER in order to change the size, tolerance, or beveling - otherwise the joints will be too tight. Stewart Coffin is a renowned designer of interlocking mechanical puzzles, having produced a wide range of ingenious designs of various shapes and complexity. More information on Coffin, and a variety of other printable models of his designs, are available in the [Stewart Coffin Puzzles](https://www.thingiverse.com/asiegel/collections/stewart-coffin-puzzles) collection. Happy puzzling!