Anker Power Port III (Model A2667) USB C cable strain relief sleeve

Anker USB C adapters have USB C ports that don't always grip the cables tightly.  Cables are prone to slipping out when tugged even slightly.  This often results in device charging stopping which you never want to find out right before you need to leave the house.  This sleeve slides tightly over the adapter and grips the cables in an attempt to provide strain relief for the cables.  The sleeve is removable and must be slid off and on again to plug and unplug cables.  This sleeve is probably best used when the cable mostly stay connected vs. if you frequently swap cables.

Print in the material of your choice.  Model prints fine without supports despite a small overhang.  if the channel for the head of your cable is a little too small and you can't slide the sleeve on far enough you can scale the adapter's height somewhat.

This is a fairly simple model and may not be perfect for your needs but I've found it to be so helpful that I wanted to share.  I hope it helps you too.