Magnet pen holder

This model is a pen holder that can be attached, for example, to a refrigerator.The holder requires separate magnets with a diameter of 15 mm and a thickness of 3 mm.I designed the holder myself and then printed it using a 3D printer. https://www.ebmia.pl/magnesy/101478-magnes-staly-cylindryczny-n38-15mmx3mm-neodymowy-niklowany.html