I used neodymium magnets (as on the thumbnail) to attach the brooches: disk Ø10×3mm outside (other forms and sizes may be used) and 5×5×3mm inside - middle7s.stl has slot for this very size. I also added middle7r.stl with slot for disk Ø6×3mm magnet (though I did not test it).
All published STL files have 7-fold symmetry - this could be changed by value of N in common.scad (and regenerating the data in OpenSCAD).
| brooch-concave.scad | 911.0B | |
| brooch-convex.scad | 893.0B | |
| brooch7-concave.stl | 2.9MB | |
| brooch7-convex.stl | 3.6MB | |
| common.scad | 90.0B | |
| middle.scad | 1.5KB | |
| middle7r.stl | 1.8MB | |
| middle7s.stl | 1.7MB |
