Our Z axis consists out of a dove tail slide, carriage, two leadscrew mounts, a motor mount, stepper motor, motor mount and a bunch of screws.
Materials:
10mm thick aluminum stock
20mm thick aluminum stock
3mm aluminum sheet
20mm round aluminum stock (or buy a shaft coupler)
15x50 brass stock
3mm brass sheet
M5x20 hex socket cap screws 4pcs
M6x6 grub screws 2pcs
Tools:
(CNC) mill or a friend who has one.
M5 tap set
M6 tap set
We made our linear slide from some materials we had laying around the shop so please feel free to alter the design and use different materials. I believe you could just as wel 3D print the spindle supports, motor mount and probably even the shaft coupler and the carriage. But for accuracy you will want to mill out your main dove tail linear guide.
You can use our plans to make the nessecary parts.