Im going to start using cable braid on all the internal cables for my company some time soon, as part of the research into this I requested just about every type and size of cable braid there is to find out which sizes are suitable for which cables. First of all, nylon braid is less flexible than polyester braid and thus you cant get it as "tight". I suggest only using polyester. For standard molex wires: 6mm 3:1 The tightest sensible braiding is 6mm 3:1 polyester. This type of braid fits super snug on drive connectors and looks good (instead of being all baggy and loose). 8mm 3:1 heatshrink is just about right. For 2 & 3 pin fan wires: 4mm 2:1 4mm 2:1 or 3:1 polyester braid fits very snug, although, you will only be able to fit it over the fan connector if its 3:1 kind (i suggest removing the connector anyhow). I found 5mm 3:1 heatshrink worked best on these wires. ATX Extras (HDD LED, Power Switch): 8mm 3:1 You will need about an 8mm polyester braid, and I suggest the 3:1 type to make it fit without clicking. This is a touch on the baggy side but theres nothing you can do, unless you fancy cutting off the connectors. I found 10mm 3:1 heatshrink to be ideal for securing these cables. ATX motherboard line: 15mm 3:1 I found it takes far too long to remove the connector so I settled on choosing a braid which fits over it: 15mm 3:1 polyester can JUST about be squeezed over the connector, and if pulled tight isnt too baggy. Youll need 32mm 4:1 or 6:1 heatshrink tubing to secure this ("medium wall polyolefin"). As most of you probably know, only cut the stuff with a soldering iron or match, not with scissors! In the UK, www.printasleeve.co.uk is a good supplier of all of the above products, and they will supply amounts as small as 5 meters aswell as 2000m coils! There are many other suppliers too.