Hi - this is a remix of Kai's Magsafe power connector at http://www.thingiverse.com/thing:15220 It connects the plug on the USB port to the power cable to stop the latter falling out - I've re-sized it for a MacBook Air (it has skinnier power connector than the original) Solidworks source file is included - its a friction fit onto the plugs so the dimensions may need tweaking a little depending on your print settings and the USB plug for the device you use - enjoy! DaveJust print it out! No support necessary - pretty much prints solid