This money clip uses magnets to keep a grip on folding currency. It also doubles as a refrigerator magnet/note holder.
The magnets are quite strong, so keep this away from anything that is sensitive to strong magnetic fields.
Print the money clip.
The magnets are:
The 3d design and print files can be found at:
First, orient the magnets so that they are attracting each other. Next, slide them into the money clip.
They have so much attraction that they will never fall out, thus there is no need to glue them or plug the ends of the holes.
You can remove the money clip from your pocket and place it on the refrigerator or a file cabinet.
The clip will also grip a large sheet of paper with ease.