Lead Screw & Optical Axis & Guide
The leadscrews, optical shafts and guideways in 3d printers are all part of the transport structure.
The difference is that the linear optical axis and linear guide function is similar, are support and guidance, the main difference is the installation site, in addition to the shape is not the same, optical axis is round, linear guide generally into a square on its processing has a fixed installation of the slider parts.
The advantage of roller guide is that it is easy to install, smooth walking speed, long life, and excellent dirt resistance, maintenance is also extremely convenient. The only bad thing is that the accuracy is slightly low.