Lean-2 - Tray-packing puzzle by Stewart Coffin (STC #255)

thingiverse

## Lean-2 (STC #255) ### A tray-packing puzzle by Stewart Coffin Two puzzles in one: fit all four pieces into each of the two trapezoidal openings. 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. This puzzle is one of a [series of tray-packing puzzles](https://www.thingiverse.com/asiegel/collections/stewart-coffin-tray-packing-puzzles). It was originally presented for exchange at the International Puzzle Party 30 in Japan in 2010. If you're unfamiliar with Coffin's tray-packing puzzles, I'd recommend starting with one of the others instead, before tackling this one. Coffin revised this puzzle in 2014, slightly reducing the size of the opening on the right, and his revisions are incorporated into the model. Introducing his 2014 revisions, Coffin wrote: "Bob Finn, who is very sharp at discovering unintended solutions, not only found one but his will fit into a slightly smaller tray. Thus an improved design with that redesigned tray. I do not list it as a separate design because I have never made one and it exists here only as my creation using Photoshop." Well, now it exists outside of Photoshop! There are three STL files: the pieces; the tray; and an optional lid. It's modeled using [puzzlecad](https://www.thingiverse.com/thing:3198014), and I have included the .scad file in case you want to remix it. You will need puzzlecad version 1.3 or later. ### About the Designer Stewart Coffin is perhaps the most influential 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 [Interlocking Puzzles](https://www.thingiverse.com/asiegel/collections/stewart-coffin-puzzles) and [Tray-Packing Puzzles](https://www.thingiverse.com/asiegel/collections/stewart-coffin-tray-packing-puzzles) collections. Happy puzzling!