My cable clips in my case broke, so I made a replacement. Because of the number of cables in my case, I also made an extended version which is 5mm higher. Both are tested and fit in my Corsair C70 case. The Obsidian Series use the same clip, although I don't know if the extended clip will work in that case.
Although the clips are cheap from Corsair, shipping for where I live is not.
Print at 0.1 or lower resolution because of the fillet/overhang with the recess. Infill doesn't really matter as it is so thin, it will be solid anyway.
First I took a picture of my last good clip, imported the picture as a canvas in Fusion 360 which I then traced. I then extruded it to the desired thickness and added the recess and hole for latching.