Flat Magnetic Pin

For making this pin you'll need 8x3 mm round magnets like this ones:

FEYG Magneti Neodimio, Mini Magneti Neodimio Rare Terra 8 x 3 mm Modelli Craft DIY Personalizzato Multiuso per Porta frigo Lavagna Bianca Mappa Magnetica : Amazon.it: Cancelleria e prodotti per ufficio

and use the “pause at height" function to insert the magnet during the print.