STG1 (yet another custom printer!)

I've been printing for a couple of years now, and much like a young Jedi aspiring to become a master, I felt it was time to try to make my own printer.

I had a few goals for this project:

- large print area with a relatively small footprint.
- direct drive extruder (no corexy)
- avoid rods and linear bearings where possible (z only)
- use v slot for x and y (because i wanted to play with v slot)
- use 2040 extrusion for stability.
- recycle as much of my folgertech 2020 i3 as possi