2020 Corner Bracket

** UPDATE **
The STL is now in the correct orientation... sorry for not doing that before

**UPDATE 2**
Removed the upper, and redesigned the slot braces to have a 2 rail corner, as well as the 3 rail original :D

**Summary**
Was looking around for a good strong 2020 corner bracket, and there are lots out there, but I wanted something STRONG and STURDY, one that would would take an M5 screw (10mm) and an extrusion TNUT without interference. I couldn't find one, so I made this one up!

This design is for my FLSUN CUBE, but I am sure that it will work with many other designs out there.

If there is something more that you'd like me to add, or tweak in any way... let me know!