Summary Improved motor mounts for the Max Micron Printers. My acrylic ones were OK, but over time the right one sagged pitching the rod and lead screw out of square with everything else. This resulted in allowing the Z lead screws to bind and wear out the nut prematurely. Designed these with stiffeners and stabilizers that are better setup against the frame. Includes an extra hole for another mounting screw if you desire. You likely will not need to slide them directly up against the frame uprights!! install and square the rods to the frame by measuring off the frame to the center of the rod in multiple places along it's length!