MicroPython logo keychain in OpenSCAD

MicroPython_keychain.scad

/*
   OpenSCAD MicroPython keychain - scruss, 2026-02 - WTFPL
   based on a design shared by Kritish Mohapatra in the
     February 2026 Melbourne MicroPython Meetup

   you will need the logo SVG from:
     https://commons.wikimedia.org/wiki/File:MicroPython_new_logo.svg

   sizes were guessed badly at 04:00 in the morning so may not be
   practical for actual use.

   TODO:
     1) fix sizes to be useful;
     2) (maybe) replace fragile ring with stronger channel through logo;
     3) (maybe) replace imported SVG with drawn elements.
                - see ssd1306.rst in the ESP8266 tutorial
*/

// things you can edit
size = 32; // mm
thickness = 4;

// things you can also edit, but also break
//   if you don't know what you're doing

// original SVG extents
bbox = [ 342, 342 ];
minima = [ 0, -221.350006 ];

module logo_3d() {
  // generate logo, size * size mm wide/high, thickness mm thick
  //   with origin translated to (0, 0)
  linear_extrude(thickness) scale(size / bbox.x) translate(-minima)
      import("MicroPython_new_logo.svg");
}

module ring() {
  // make a small ring half the thickness of the main part,
  //   outer diameter: (main part size) / 4 + 4mm
  //   inner diameter: (main part size) / 4
  linear_extrude(thickness / 2) difference() {
    circle(d = (size / 4) + 4);
    circle(d = size / 4);
  }
}

// create the logo fused with the ring
union() {
  logo_3d();
  translate([ 0, size, 0 ]) ring();
}

MicroPython_keychain.stl

MicroPython_new_logo.svg

There is a much improved version here: Improved MicroPython logo keychain in OpenSCAD