Explore the process of building a vertical machining center, also known as a CNC knee mill, primarily using 3D printed parts and aluminum profiles. Learn about the construction of various components, including the lifting XY table, XYZ movement system, and tilting head. Discover the use of Nema23 motors, ball screws, and MGN12 linear guides in this DIY project. Follow along as the creator assembles the frame, wires the system, and conducts initial tests. Gain insights into the challenges and considerations of building a custom CNC machine, including the need for protecting guides and ball screws from debris during milling operations.