After buying new markers for the whiteboard, the idea came to organize their storage on the whiteboard itself.
A mount for a set of six pieces was hastily modeled.
I cut it in a slicer for printing, set the parameters so that it was enough for the remnants of the PETG plastic coil of transparent red color.
I pasted a magnetic base on the back surface, used it from the 3d printer table.
I will be glad if this model helps anyone.