Hypercube X carriage with i3 rework compatible mount

This is simply an X carriage foo the fantastic Hybercube printer by Tech2C.

This item is remix of the hypercube carriage remix proposed by arturslab (capitve nut locks).

My contribution:
- redefined the mounting holes to be compatible with prusa i3 rework (M4 holes, 23mm horizontal and vertical spacing) to reuse a lot of existing mounting for extruders and hotends. There are 3 out of 4 holes due to limitations in the carriage. Those should be more than enough.
- I also added mounting ho