Hey Qbert
You should probably post a link to the item for those in the know to examine... Seems like a good price.
If you wish to use it with the reprap configuration I believe it needs to be a 5.5 volt cable as the motherboard is powerd that way. If you are using the Makerbot configuration (where 5v power is supplied by the ATX) then I would imagine you could use a 3v cable - but I do not have first hand knowledge of this option though.
I use the makerbot config with a 5v cable. This then will allow me to program my extruder without ATX power as it provides the power for the board when I program it. Maybe it would still happen with a 3v cable but I am not sure.
