Laid out Z-direction motion components and marked out the hole locations very accurately (hopefully). Drilled and tapped all the mounting points for the rails, the ballscrew supports, and the stepper motor mount. Also drilled and tapped holes for a slightly longer set of rails (for upgradability) and also end stop blocks that can hopefully be 3D printed and would serve as mount points for the limit switches but also prevent the carriages from sliding off the rails in any direction, especially down due to gravity.