This is a remix of @Mark_10789's desktop cable guide. The cables run parallel to the surface of the desktop, which works better for some of my thicker cables. (The last photo shows this model in purple and the original in black for comparison.)
The mounting plate is sized to work with “Alien Tape” by default, but the Fusion 360 model is parametric to allow it to be sized according to need. The plate can also be extruded in either direction, if you prefer the hinge to be on one side or the other. I don't recommend extruding in both directions because the print-in-place hinge is designed to be printed vertically.
Print in the orientation shown in the photo. As with Mark's original, this should be printed with 0.2mm layer height and support enabled to allow the print-in-place hinge to work. I use a support blocker on the cable holes because the slicer wants to support the fillets but it's not needed and it decreases the surface quality. I have included a 3MF file with that blocker as an example.
Once printed, remove as much support as you can, then gently open the hinge and exercise it a few times.
My model's magnet wells are sized for “10mm x 2mm” magnets that are actually 10mm x 1.76mm. I use two on each side for increased hold, so my magnet wells are 10.6mm x 3.6mm and that works great. These dimensions are parametric in the F360 model. The magnets need to be glued in.
The author remixed this model.
I flipped the orientation of the model so that it sits on top of the desk, allowing the cables to run through it parallel to the desktop. This works better for some of my thicker cables.