Since I started with 3D printing a few years ago, I always try to replace off-the-shelf items (usually expensive) with similar items that I find on Thingiverse / Printables / Thangs or, preferably, that I design myself, according to my needs. One of these items is a cable organizer. There are countless items available for download on the mentioned repositories, but I decided to design my own, simple, using little material and suited to my needs.
In the following video (only in Portueguese, for the moment), I provide a quick tutorial on how to make my model, so that it can serve as inspiration for you to make your own.
You can check the organizer project directly in TinkerCAD:
But if you just want to download the object for 3D printing it, you can access the link below, on Printables.com:
https://www.printables.com/model/622311