If you're like me, you've probably gawked at pictures of builds with custom-sleeved cables that are perfectly cut-to-length, and meticulously organized, for that absolutely stunning look. That said, actually cutting PSU cables and individually sleeving them is a very time-consuming and tedious endeavor to say the least, so if you're also lazy like me you've likely realized that ain't nobody got time for that, and settled for whatever cables were provided with your power supply.
Fortunately, while custom sleeving used to be a mandatory weekend project of sorts, there's been a rise in the past few years of companies like CableMod that make replacement cable sets for modular PSUs. This means that, for a price, you could buy the fancy sleeved power cables rather than go through the toil of making them yourself... but the problem then became one of living with off-the-shelf SKUs, where the cable lengths are fixed. Indeed, while you'd get the look of individually sleeved cables, the length of the cables would almost always be excessive for a SFF build, leading to bundles of wires that could clutter up a case just as bad - if not worse - than the very OEM cables they replaced.
Read more here.