Anycubic i3 Mega - Dual Z-Endstops

anycubic_i3Mega__ZEndstops
- A temporary design that isn't entirely perfect but has managed to survive long enough that I no longer feel the need to improve it....yet.
- Uses standard reprap endstops, not the anycubic ones with the unusual mounting hole configuration.
- Allows easy installation and height adjustment by replacing two M3 bolts on the front of the mega's case with a slightly longer one. The M3x6mm that is already installed in the front of the case may be long enough, iirc i used