Simple cable mount that allows cables to slip in and out for maintenance or reorganization. PETG is recommended since the part flexes, but I have had no issues with PLA yet. 

Use OpenSCAD to modify the model. Edit the variables at the top of the file. Included stl files are examples used with ethernet cables. 

Modify the number of cables, cable diameter, depth of the clip, and whether or not to include the nail mount. Mounting tape would work well if you don't want to use nails. 

Print a couple test pieces to make sure your tolerances are good. I found 7mm cable diameter worked for my cat 6 ethernet cables, with a bit of play in them.