Parametric/customizable cord holder

Simple cord holder with a clip to attach to a tabletop / side of the table

Cord size of 3mm works fine for Apple cables;
For the few of a USB-mini cables from various devices I had, 3.5mm worked better.

A few pre-built STLs are included:
cord_holder_3x16.stl: cord diameter: 3mm, clip size: 16mm
cord_holder_4x17.5.stl: cord diameter: 4mm, clip size: 17.5mm
and so on