Printer users can now replace bronze sleeve bushings or linear ball bearings with polymer sleeve bushings. These are supplied in Vesconite Hilube (a low-friction polymer) or in Vesconite Superlube (an ultra-low-friction polymer). 3D printer users report a phenomena called “dimpling and pimpling” when a rod becomes nonuniform. This phenomena is caused by the rod slightly lifting on one side and slightly tilting on the other side, as the extruder head moves from one side to the other. This is typically a result of wear to the rod. 3D printer users report that this phenomena is eliminated when Vesconite Hilube bushings are introduced.