When you're building a 3D printer, a cutter, or anything else, it's critical that you have guide rails. It's what the motor follows in order to produce whatever you have programmed. Without the rails, you cannot fully operate your device. As you shop for guide rails, you will want to consider what you need in regards to the length of the rails, the height and width of them, as well as the weight. When you choose good quality rails, it ensures that you get the technical specifications that you're relying on. At DIY Geek, we have you covered with linear guide rails, rail carriages, and more.