Befenybay 200mm 4080U Z-axis Screw Slide Table Linear Actuator Kit Linear Module for 3D Printer and DIY CNC Router Parts X Y Z Axis: Amazon.com: Industrial & Scientific
Homemade DIY CNC build part 3 (Z-Axis) - YouTube
My DIY CNC - Z-axis I plan it something like this. - CNC Routers - Maker Forums