Hypercube Horizontal Conversion

###Hypercube Horizontal Conversion

What is it?
---------------------
This is a complete conversion from the default Hypercube layout, it rotates the rods to be horizontal and aligns everything in the center of them.

* Balanced symmetrical horizontal carriage means less vibrations with high jerk and acceleration.
* Smooth shaped ducts provide high airflow through the ducts.
* Easy adjustable belts.
* Seperate printed spiral bushings with integrated BLTouch mount.
* Centered belts on carriage inbetween X rods ensures less binding.
* Perfectly aligned XY joiner ensures the belts run parallel.
* 300x300mm build space retained on HC300 by moving the bed back.

Current limitations:
---------------------
For now it is for sensorless homing only, if interest is high enough I will be able to stick a limit switch on the parts as well as add an inductive probe if I get the offsets from somewhere.

This design has the nozzle raised up higher that a default Hypercube which can