The RepRap Mendel design is a basic Cartesian robot. It positions the extruder using three axes to calculate a point in space. There are many different frame designs that can achieve this. The Prusa Mendel design moves the build platform along the y axis and the extruder across the x axis. The entire x axis assembly is raised and lowered along the z axis. Belts, pulley bearings, and rods are necessary to achieve this movement. The primary visual difference between most 3D printers is what holds it all together. This is the frame, and it should be sturdy and well maintained.

In this recipe, we'll look at some issues that can affect this system and how we can keep it well maintained.