This is a slight adjustment of Intentional3D's USB cable flash drive, which I made slightly wider and longer to fit my fatter USB that I ripped out of a cheap $2 store figurine.
I'm pretty happy with it, but thought a larger version might be useful for people who have slightly bigger thumb drives and don't want to waste time carving out the inside of their prints.
Step 1: Print it!
No need for supports, just print it and go (print it upright, small end at the top).
Step 2: Destroy an iPod or other USB cable, keep 1 end neat and fray the other
Step 3: Add a little bit of glue for the cable, and I also added a little glue to the USB (this is only needed if it doesn't fit snugly.
Step 4: Profit.