X3D XL COREXY Dual Z

Remix allow to use two carriage for Z axis. It give me confidence in Z axis motion, better prints quality and additional 28mm working area in Z axis.
You will need:
- 1 additional stepper motor connected to free space in Ramps (Ramps have two slots for Z axis)
- two 334mm length 8mm rods
- two 234mm and two 335mm aluminum angle bar 20x20x2
- standard plastic element from original printer design
- two dual_z_carriage.stl (I sliced it in Sli3er because e.g. Cura have problem with this desi