Minimal construction for your 3D printer and CNC machine tool. High flexibility: MGN9H linear guide rail can provide multi-functional and easy-to-use operation on any 3D printer and CNC machine.

Here’s an interesting experiment that attempts to measure the quality of a linear rail by using a form of ... profile something like these cardboard CNC modules.

completely forgoing linear rails in favor of strings. The closest thing to a linear guide found on the Marionette is a pane of glass against which the top surface of the print head slides.