We have over 20 cables with diameter of 4mm for power supples and desktop multimeter.It is hard to arrange them on a convenient spot on the working table. Since the shelf on the working table are made of wood and iron, I designed Magnetic Cable Clips for D=4mm cables. They work good.
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Step 1: 3d Printing Files
Step 2: Others Materials
1.12 X 3 mm Neodymium magnet 12X3 Neodymium magnet
2. glue(only if the 3d printing parts does not work well, can add the glue between the case and the magnet