Improving the mini lathe cross-slide

Adding rolled bearings for smoother operation. Optionally adding a NEMA 17 stepper motor.
No motor: https://www.thingiverse.com/thing:471...
With motor: https://www.thingiverse.com/thing:471...
Bearings: 608 on the front and 688 on the back. Exact models I used (but other should also work): 608-2RS and 688ZZ.

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