Puzzle ring bracelet (parametric, OpenSCAD)

thingiverse

This puzzle ring (sometimes called a "Turkish wedding ring" or "harem ring") has four interlocking bands. However, this one isn't a finger ring because the puzzle is too delicate when printed that small (I tried it). So I made it into a bracelet. The puzzle is rather difficult at first, but once you learn it, it's fairly easy to assemble after scrambling the interlocking parts. The puzzle [solution is available online](https://ourpastimes.com/puzzle-ring-instructions-4596068.html). The size can be adjusted with the OpenSCAD parameters. The STL files provided are elliptical rings with 90mm and 80mm axes, which fits a rather large hand (larger than mine, as you can see from the photograph). In the OpenSCAD script, the "soluble" setting renders the entire assembled ring, with 0.2mm gaps between them, to be filled with soluble support material. See printing notes below for caveats. The "insoluble" setting is for break-away supports, and is much faster if the same material is used for everything. However, the two inner rings have rough stepped surfaces because they are not being printed parallel to the buildplate. The "clip" setting prints a small clip to hold the puzzle together.