Double-Sided Hangable G-Clamp

This is a remix of johann517's excellent G-Clamp (http://www.thingiverse.com/thing:1673030). I've made the clamp double-sided and added a ring that can be used to hang it (e.g. suspend from a ceiling).

It's useful for all sorts of things! You can extend-a-shelf from basically anywhere it can clamp on to. You can also use it to hang things up in your kitchen, garage, etc by clamping it where you want and then clamping the thing to the other side of the clamp.

It can also be used to _chain things together_! If you use the ring to hang something from a ceiling, for example, you could then chain those things together by clamping each side of the thing you're hanging one to the next, to the next, so on and so forth.

Example usage:

* Hang boards from the ceiling to make a really, really long shelf.
* Chain-hang LED light bars.
* Use it in the kitchen to attach a cookbook or tablet to your cabinets for easy viewing.
* Hang parts up to dry.
* Use it as a regular G-clamp (wh