M3 nut driver

All those M3 nuts on the Makerbot Cupcake drive me crazy, especially the ones that are hard to reach on vertical surfaces inside things. I wish I had something like this when I was building my cupcake.

This has a hex hole on the end that should be just about the right size for a single M3 nut. My machine calibration might be a bit off, so the hole might be too big, let me know! The hole should be snug enough that the nut stays in a little past horizontal, but not so small that you have to p