Bangle-Insert

[Bangle.js](https://www.kickstarter.com/projects/gfw/banglejs-the-hackable-smart-watch) is "an open source, AI-enabled smart watch that can be easily customised" (because it can be programmed in JavaScript)

One problem, though, is that you may easily break your watch if you reverse polarity of the magnetic power connector. For a (somewhat) fool-proof solution, I made this trivial insert which prevents you from attaching the power connector in the wrong direction.

The insert has been modelled with [OpenJSCAD](https://openjscad.org/) (script included) and designed in a way that even less precise FDM printers should be able to print an insert which fits nicely. Users with STL printers should perhaps add a hole to the ground plate in order to let uncured resin flow out of the base.