So... I like did this thing a week or so ago that left me with a very useful, albeit nekkid, USB key:

https://www.thingiverse.com/thing:2961059

Out came the calipers and I found that this sleeve slipped on just right. I added a dabble of super glue to hold it there permanently.

It should also be noted that I used PVA for this print and it has a nice soft texture.

If you found this useful, it would bring me great joy to see your work - so be sure to share; especially if you print the casing in transparent filament! :)

Or, better yet, please feel free to dump a bitcoin or two here (I'm trying to collect as many as I can before the apocalypse):

1Py3TUeR8noBN2giHyFV1GfB6x3Kh2WEVv

... include a note to the effect of "Hi 3E8, thanks for the USB Sleeve thing... my life is infinitely better on account of it and please accept this small handful of bitcoins in gratitude".

You're welcome! (in advance) :D

Also, feel free to peruse my other submissions which are almost as varied as they are many:

http://www.thingiverse.com/3E8/designs

Enjoy!