Choosing the right rail and carriage needn't be rocket science. Here's the lowdown. Linear rails come in two types, round and square. The criteria for choosing one over the other is no different than ...

Design refinements boost performance of self-aligning ball bushing while maintaining their error-correcting nature.

Adding linear rails to a length of aluminium extrusion is a common way to make a fairly rigid guiding structure, and I have been doing just that in the workshop. But things were not working quite ...

In the early days of 3D printers, most builds used smooth rods and bearings that rode on them. But these days, printers are shipping with either V-slot extrusions with Delrin wheels or linear rails.