Scalar - Upgrade Z Axis SFU1204 Ball screw

# Description
This thing is a mechanical upgrade for Scalar XL 3D printers.
This upgrade allows to use a SFU 1204 ball crew instead of a standard M8 leadscred on Z Axis.

For the convertion, as the Ball screw often requires a special Nut, the ballscrew has to be moved a little bit, for the nut to fit the overall existing design of Scalar XL.

# What to print
So you wil need to print
- The bottom Z axis motor holders
- The Top Z axis smooth rod holders
- The X axis moto holder
- The X