Customizable Cordless Power Tool Belt Clip

I like being able to hang cordless power tools from a belt, particularly when climbing ladders. I have a hook on my tool belt, but it's far more versatile if the tool itself has the hook.

I'm still refining the design to allow for customization, but the current test parts fit my Ryobi drills and drivers perfectly.

Update 2017-02-23: various tweaking, now customizable, and [when I saw this](http://www.thingiverse.com/thing:2121409) it occurred to me that I could fit a sweet little bit holde