Remade Z-axis

I realized the first version was stupid, and it would be much better if I kept the motor and extrusion on the spindle mount so I could get much more z-axis space. Since this mill is going to be super small, having the extra Z-axis space will be very nice.

For more detail:

Having the rollers and threaded rod nut on the carriage would mean that the threaded rod and extrusions would need to extend all the way to the lowest z-axis position, severly limiting the maximum z-axis height. By keeping the motor and extrusion on the carriage, they extend up away from the work area, meaning the amount of z-axis space is only limited by the length of the extrusions and threaded rod.

I also swapped to using the clamping mount meant for these motors instead of screwing plates to the face. This lets me mount the carriage higher to get even more space.

The next part is attaching it to the rest of the CNC