A neodymium magnet attachment for a pen.
Doubles as a magic ring if you have tiny fingers (try it at your own risk, though)

Neodymium magnet dimensions: Ø 10 mm x 2.5 mm

Pen diameter: Ø 13 mm to Ø 13.3 mm

Print time: 21 minutes
Filament used: 0.36 meters of PLA

Estimated material cost (PLA): ~0,03 €
(Calculated from 200 m spool with a price of 17,99 € ≈ 0.08995 / m)

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3D Printing glue stick was used to ensure that the model doesn't lift from the platform, since the design is relatively thin all around, and might cause them to lift up during the first few layers.

After rubbing the printing glue away with a water dampened cloth, the top side might benefit from mild filing, sanding or from a couple of swipes with acetone dampened cloth (makes the surface smooth.

The model was made using exact measurements, thus some filing might be required due to material shrinkage.