I wanted a cable organizer or keeper that attaches to the top of the desk but holds the cables behind. This uses command strips or double sided tape.  

The uploaded STL can hold 4 cables.  If that doesn't work you can use the FreeCad model and change the “Count” parameter in the spreadsheet to any number you want. There are other documented parameters if you need things to be larger or smaller. 

I recommend using PETG so there is a little more flex in the arms to allow the cable to be pushed in.