A simple tool to help align the xy carriage rods of the Vertex K8400. The rods for the XY carriage should be as parallel as possible. Print 2 of these and clamp them onto the rods. This will align/tune the rods to become parallel. Then tighten the pulleys and belts. Please note this is my first design and I needed to tweak the scale a bit to print correctly on my Vertex. Update: added two photos showing how I first aligned the rods because at that time I couldn't make proper prints. I prepared 2 helpers from wood (both are cut to the EXACT same length).