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Signing UpStep 1Gather the materials and tools
Dremel
2 x Standard USB to Micro USB cables
Black Spray Paint
Bluetak
Hacksaw with wood cutting blade
Single sided sticky foam
Wood
Felt (Which I didn't actually use, as I could get the controllers to fit)
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Also, I have also looked into the USB powering issue and from what I have researched, the absolute maximum amount of power the can be drawn from a USB is 500mA. as long as the device reqests and is given more then the 100mA baseline. My USB keyboard that I use for the PS3 draws 5V --- 250mA and works fine.
Therefore one could conclude that since a PS3 controller draws 3.7V and only 30mA (it's on the back of the controller) then is is definitely feasible to have 4 controllers. Even 7 which is the max the PS3 can recognize. While 3 controllers would still be under the 100mA baseline. As far as the voltage, it would be shared through all the ports. ( I think)