Ender Attached Tool Holder

I originally had printed [a stand](https://www.thingiverse.com/thing:5725919/) for holding tools and it worked well, but I realized that it only held like two things I routinely used, and with new tools nothing really fit very well any more.

So I used that one as loose inspiration and made on that *does* hold the tools I use. Mounts in to the v-slots on the left side of an Ender 3 and anything else that uses a 2040/4040 rail (probably).

First I measured and modeled out all the tools I wanted to put in it. Included are:
* [Amervault Scrapers](https://www.amazon.com/dp/B075SLTY8B)
* Four of the [Bovulo Hobby Knives](https://www.amazon.com/dp/B0B5ZMLV36) (there are *many* clones of these!)
* [AFA Deburring Tool](https://www.amazon.com/dp/B08SLFVVXF)
* A Bic Mini Lighter
* Two declogging needles
* Two old poking needles in hobby knife bodies
* One or two hangers for snippers

With all those things measured and such, I made holes with a little clearance (+3mm⌀ on the smaller