3d design.scad

scale([4, 4, 1]) {
 translate([20, 20, 0]) {linear_extrude (height=1) {circle(26);}};
 color([0, 0, 0]) {
   translate([0, 26, 0]) { linear_extrude (height=3){import("wifi.svg"); }; }
   translate([2, 15, 1]) { linear_extrude (height=1){rotate(90){text("wifi", size=5); }}; }
   translate([43, 12, 1]) { linear_extrude (height=1){rotate(90){text("hs3.pl", size=5); }}; }
   translate([16, -2, 1]) { linear_extrude (height=1){text("QR", size=5); }; }
   translate([28, 43, 1]) { linear_extrude (height=1){rotate(180)text("NFC", size=5);}; }
 }
}

Readme.md

Notes

• Not sure Pillow is needed (since we're exporting to SVG)
• The above almost works. For some weird reason, OpenSCAD doesn't think the resulting mesh is closed. The solution is to seperately render the extruded QR code, and the rest, as two STL files, and then combine them in the slicer.
• In the slicer, you would have to fix the colours (not sure if colours would be fixed automatically if OpenSCAD exports to .3MF)
• The NFC label is because I also stuck an NFC sticker on the back of the print.

**Bounty: I buy you a beer if you can explain to me why the openSCAD file as advertised doesn't work, and how to fix it (note: I didn't check if it doesn't work for any QR codes, it doesn't for my wifi network)

get qr code in svg.sh

#!/bin/bash
pip install qrcode\[pil\]  # or conda install qrcode pillow
qr --factory=svg "WIFI:S:MySSID;T:WPA;P:MyPassword;;" > wifi.svg