A useful cable clip designed to mount cables flush to a flat surface. Just add some double-sided tape to the back (18mm wide tape ideally). These are suitable for cables of about 3 to 4mm diameter. The base is 18mm by 12mm, and the overall height is about 6.5mm.
The STL file contains two identical clips. I've included the SketchUp file for ease of editing.
0.2mm layer height, 0.8mm shell thickness