Magnetic Arm Cable Clip
thingiverse
Clips to hold your charging cable to the Benks cell phone holder arm (https://www.amazon.com/gp/product/B0749HWT1Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). Of course, it could be used generically for anything. This is for an arm that is 10mm wide with a cable slot that is 3mm.
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