I would modify the USB ends before I modified the case. I have the exact same case on both of my Gs3's...and we have a couple of USB cables that have a thicker end on them...but it's just plastic. All it takes is a razor knife and some shaving...cut the excess plastic away until it fits. You are only talking about a wire that's abou 18-20 AWG so it would take a lot of slicing before you hit any wires by cutting the ends anyway. 1) Don't cut down to the silver USB prong, obviously, and 2) don't cut down to the wires. I wouldn't do anything to the case, as the lifetime warranty will be VOID!! And no matter what you think, you need that warranty. I closed the hood of my 2001 Ford Expedition on my phone the other day, and cracked my otterbox case, (but didn't do **** to my phone, not even a scratch!!), and the warranty sent me another case no questions asked. Stupid of me to close the hood on my phone, but hey, crap happens. If u touch that case with a knife the warranty won't cover nothing. Not to mention the dust flap won't ever work right again, so you might as well cut it off if you do that...and you need the case to be in-tact to file any type of warranty (you might break the outer plastic shell, but it's highly doubtful you'll ever tear the plastic protective sleeve if the shell is on it properly.)