DIY Coupling: A coupler for the motor and lead screw (from Marc K.)
This creative coupling solution comes from another generous user of the site. He has devised a way to couple the motor to the leadscrew with standard aluminum tubing. Marc has graciously allowed me to show you this creative idea.

Diagnosing and Fixing a Non-working Axis
Are you pulling your hair out trying to solve issues with your CNC machine? Maybe the X-axis has decided to play hard to get? Don't fret. In this video, I'll walk you through the intricate maze of CNC electronics, from transformers and drivers to contactors and controllers. We'll diagnose a real-world problem with the X-axis of a CNC machine, using nothing but methodical testing and common sense. So, grab your multimeter and let's turn that blinking error light into a green light of glory.

Bill of Materials
Many of you have asked me to provide a list of materials and costs for the CNC Machine. Here, I will provide a list of the materials, costs and where they can be purchased. In the list, I will also include various alternatives for different types of applications. This may include types of cutting tools, types of motors for the axes, etc. I will keep this list alive and updated in the "stuff for sale" in lieu of a better place. Please write me with suggestions, and if you know of better prices and places to get these materials. This list is a work in progress, since I wanted to make it available immediately. Most prices are from memory, until I find my receipts somewhere in one of my packing boxes, so you may see numbers change, but it gives you a general idea.