3Drag (K8200) electronics case

Big thanks to Wallie for getting this thing started. I chose the "K8200 Cover with 40mm Fan" as a starting point because it was the most robust electronics case for the 3Drag on Thingiverse. Now I hope everyone else can benefit from my exercise in learning how to use Blender.

I know why Wallie chose to put the fan on the back edge of the case, but the stepper chips really need an exhaust right above the chimney. That meant that I had to move the keyway for wiring. Not a problem, the relief is