Update: I added a variation with a wider opening. Although the original one held the cables well even when the clip was open, it was sometimes hard to get the cables in and out.

This is a remix from a model on Thingiverse - I redesigned it from scratch in OnShape to suit me. The model on Thingiverse closed/opened way too easily for me. This one snaps shut with a satisfying click.

This is a print in place model, use a blade to loosen the hinge after printing.