A clip for preventing cables from falling of a desk when they are detached. It's printed in two parts to make sure the clip won't break on layer boundaries. Both parts can be easily adapted to a specific desk and cables by changing some values in the “dimensions” spreadsheet in FreeCAD. The clamp model available for download was created for a 36.7 mm thick desk and cable clips are provided in two sizes: 7 mm (useful for ethernet cables) and 5 mm (for USB or laptop power cables). Due to a very tight fit (on purpose) clicking both parts together may not be easy, especially for the last few millimeters. I suggest placing the clip an edge of a desk and using something flat and hard to press the clip against the desk (as shown in the last photo).

I suggest printing this in PETG with 3 perimeters and 15% concentric infill.