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.

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.

Key to success: Rails built to keep out contaminants. Stretch a carpet an extra inch, save $100,000. That was what a manufacturer of ready-to-mount automotive carpeting was trying to accomplish with a ...