Anycubic Kossel Controller Box

##Anycubic Kossel Controller Box
This upgrade is designed to provide better cooling to the electronics by changing the mainboard's location. Furthermore, it mounts up to two MOSFET modules.

I designed this upgrade together with the PSU Box, which you can find [here](https://www.thingiverse.com/thing:2668945).

###Why Did I Design This?
Especially when the Delta uses a heated bed, the electronics operate in a warmer environment. To avoid overheating and to mount the PSU when adding a heated bed, I chose to design a case for each of them and mount them on the back extrusion.

###Features
* Can be mounted in two distinct ways (see below).
* Mounts the **TriGorilla mainboard** with access to both plugs.
* Dimensions: 169x138x62 (depends on how it's mounted...).
* **Up to two MOSFET modules** can be mounted.
* **Easily printable** on the normal Anycubic Kossel **without supports**.
* Stepper driver cooling with the help of the **"Stepper Motor Aero Tunnel"** by Facocero, whi