I am really impressed about michelem's Ultimate Magnetic Cable Holder.
https://makerworld.com/en/models/146614#profileId-159858
But unfortunately I hade neither TPU available nor experience in printing TPU. So I decided to design the caps in two parts to be able to print them in PLA/PETG/etc.
The clips were designed for magnets with the dimensions 10x2 mm and are compatible with the linked magnet holder but can also be used as stand-alone clips on any magnetic surface.
For your information - the 3mf file only contains the clips but not the corresponding holder.
Have fun!