(Parts 23/24) Z Stepper Mounts need redesign

[jon-harper]

Goals:

• Quicker print
• Added wire anchor spots
• Designed around thrust bearing

[jon-harper]

Thrust bearings have arrived. Using F8-16M bearings (8x16x5mm).

[jon-harper]

This is still important, but I've removed the priority label because it's not critical to moving ahead.