Looked for some Cable Combs for my Corsair (Original 12VHPWR) cable.
I use the 2PCIe to One Cable, havent tested if this works for the 3 in 1 cable. The dimensions are as tight as they could be. Any smaller and its almost unprintable with my .4 nozzle.
There are other versions on printables, but these werent anywhere near to be printed with my P1S. Settings needed some tweaking. The brim MIGHT not be necessary, but its easy to remove with a scalpel).