I discovered that the basic tools I needed to have near at hand at all times were my 1.5 & 2.5mm allan wrenches, phillips screwdriver, and the wood spacer for the hobbed bolt.

As I tend to misplace any tiny loose objects, I created this 41mm wide little tool holder to keep the main things I need at hand, but out of the way.

I've attached the holder directly to the printrbot with velcro, so I can change it out as my tools change.