I use a few tools together with my printer all the time. These are Allen hex keys, electronic calipers and a USB adapter for microSD cards. I decided to make holders for the tools that are printable in PLA and snaps in place without the need for screws. This particular thing is a hook that I use for the thin end of my electronic calipers. It should be just under 5 mm wide when printed. The fat end hook is found at http://www.thingiverse.com/thing:517213